21121022010111 has 32 divisors (see below), whose sum is σ = 28626974069760. Its totient is φ = 13848842380800.

The previous prime is 21121022010107. The next prime is 21121022010133. The reversal of 21121022010111 is 11101022012112.

It is a happy number.

It is not a de Polignac number, because 21121022010111 - 2² = 21121022010107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121022010311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1104588631 + ... + 1104607751.

It is an arithmetic number, because the mean of its divisors is an integer number (894592939680).

Almost surely, 2^{21121022010111} is an apocalyptic number.

21121022010111 is a deficient number, since it is larger than the sum of its proper divisors (7505952059649).

21121022010111 is a wasteful number, since it uses less digits than its factorization.

21121022010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31447.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121022010111 its reverse (11101022012112), we get a palindrome (32222044022223).

The spelling of 21121022010111 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, ten thousand, one hundred eleven".