21100121022 has 16 divisors (see below), whose sum is σ = 42217935120. Its totient is φ = 7030424832.

The previous prime is 21100120973. The next prime is 21100121033. The reversal of 21100121022 is 22012100112.

It is a junction number, because it is equal to n+sod(n) for n = 21100120989 and 21100121007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721683 + ... + 750350.

It is an arithmetic number, because the mean of its divisors is an integer number (2638620945).

Almost surely, 2^21100121022 is an apocalyptic number.

21100121022 is an abundant number, since it is smaller than the sum of its proper divisors (21117814098).

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

21100121022 is a wasteful number, since it uses less digits than its factorization.

21100121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474427.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100121022 its reverse (22012100112), we get a palindrome (43112221134).

The spelling of 21100121022 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, twenty-two".