21121111112052 has 48 divisors (see below), whose sum is σ = 56390903999360. Its totient is φ = 6027323778432.

The previous prime is 21121111112051. The next prime is 21121111112191. The reversal of 21121111112052 is 25021111112112.

It is a happy number.

It is a super-2 number, since 2×21121111112052² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121111112051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151584043 + ... + 151723314.

Almost surely, 2^{21121111112052} is an apocalyptic number.

It is an amenable number.

21121111112052 is an abundant number, since it is smaller than the sum of its proper divisors (35269792887308).

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

21121111112052 is a wasteful number, since it uses less digits than its factorization.

21121111112052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303308200 (or 303308198 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 21.

Adding to 21121111112052 its reverse (25021111112112), we get a palindrome (46142222224164).

The spelling of 21121111112052 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, fifty-two".