21121121001222 has 80 divisors (see below), whose sum is σ = 52356581950464. Its totient is φ = 6310194030000.

The previous prime is 21121121001203. The next prime is 21121121001223. The reversal of 21121121001222 is 22210012112112.

21121121001222 is a `hidden beast` number, since 21 + 1 + 211 + 210 + 0 + 1 + 222 = 666.

It is a super-2 number, since 2×21121121001222² (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 = 21121121001195 and 21121121001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121121001223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83341654 + ... + 83594697.

Almost surely, 2^{21121121001222} is an apocalyptic number.

21121121001222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121121001222 is an abundant number, since it is smaller than the sum of its proper divisors (31235460949242).

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

21121121001222 is a wasteful number, since it uses less digits than its factorization.

21121121001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166936447 (or 166936438 counting only the distinct ones).

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

Adding to 21121121001222 its reverse (22210012112112), we get a palindrome (43331133113334).

The spelling of 21121121001222 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, one thousand, two hundred twenty-two".