21122021001222 has 12 divisors (see below), whose sum is σ = 45764378836020. Its totient is φ = 7040673667068.

The previous prime is 21122021001199. The next prime is 21122021001223. The reversal of 21122021001222 is 22210012022112.

It is a happy number.

21122021001222 is a `hidden beast` number, since 2 + 11 + 220 + 210 + 0 + 1 + 222 = 666.

It is a super-2 number, since 2×21122021001222² (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), and also a Moran number because the ratio is a prime number: 1173445611179 = 21122021001222 / (2 + 1 + 1 + 2 + 2 + 0 + 2 + 1 + 0 + 0 + 1 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21122021001195 and 21122021001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021001223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586722805572 + ... + 586722805607.

It is an arithmetic number, because the mean of its divisors is an integer number (3813698236335).

Almost surely, 2^{21122021001222} is an apocalyptic number.

21122021001222 is an abundant number, since it is smaller than the sum of its proper divisors (24642357834798).

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

21122021001222 is a wasteful number, since it uses less digits than its factorization.

21122021001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173445611187 (or 1173445611184 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21122021001222 its reverse (22210012022112), we get a palindrome (43332033023334).

The spelling of 21122021001222 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, one thousand, two hundred twenty-two".