21121111021122 has 48 divisors (see below), whose sum is σ = 52342868777472. Its totient is φ = 6029644515840.

The previous prime is 21121111021093. The next prime is 21121111021187. The reversal of 21121111021122 is 22112011112112.

It is a happy number.

21121111021122 is a `hidden beast` number, since 211 + 211 + 1 + 10 + 211 + 22 = 666.

It is a super-2 number, since 2×21121111021122² (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 = 21121111021095 and 21121111021104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68715954 + ... + 69022637.

It is an arithmetic number, because the mean of its divisors is an integer number (1090476432864).

Almost surely, 2^{21121111021122} is an apocalyptic number.

21121111021122 is an abundant number, since it is smaller than the sum of its proper divisors (31221757756350).

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

21121111021122 is a wasteful number, since it uses less digits than its factorization.

21121111021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137739823 (or 137739820 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21121111021122 its reverse (22112011112112), we get a palindrome (43233122133234).

The spelling of 21121111021122 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, twenty-one thousand, one hundred twenty-two".