21010121112222 has 112 divisors (see below), whose sum is σ = 51630015467520. Its totient is φ = 6356414898000.

The previous prime is 21010121112203. The next prime is 21010121112263. The reversal of 21010121112222 is 22221112101012.

21010121112222 is a `hidden beast` number, since 210 + 1 + 0 + 121 + 112 + 222 = 666.

It is a super-2 number, since 2×21010121112222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21010121112195 and 21010121112204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 8869347 + ... + 10985697.

It is an arithmetic number, because the mean of its divisors is an integer number (460982280960).

Almost surely, 2^{21010121112222} is an apocalyptic number.

21010121112222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010121112222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25815007733760).

21010121112222 is an abundant number, since it is smaller than the sum of its proper divisors (30619894355298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010121112222 is a wasteful number, since it uses less digits than its factorization.

21010121112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117001 (or 2116986 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21010121112222 its reverse (22221112101012), we get a palindrome (43231233213234).

The spelling of 21010121112222 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-two".