21122021121111 has 12 divisors (see below), whose sum is σ = 30824117880192. Its totient is φ = 13936178883456.

The previous prime is 21122021121109. The next prime is 21122021121151. The reversal of 21122021121111 is 11112112022112.

It is a happy number.

21122021121111 is a `hidden beast` number, since 2 + 11 + 220 + 211 + 211 + 11 = 666.

It is not a de Polignac number, because 21122021121111 - 2¹ = 21122021121109 is a prime.

It is a super-2 number, since 2×21122021121111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021121151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12097376631 + ... + 12097378376.

It is an arithmetic number, because the mean of its divisors is an integer number (2568676490016).

Almost surely, 2^{21122021121111} is an apocalyptic number.

21122021121111 is a deficient number, since it is larger than the sum of its proper divisors (9702096759081).

21122021121111 is a wasteful number, since it uses less digits than its factorization.

21122021121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24194755110 (or 24194755107 counting only the distinct ones).

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

Adding to 21122021121111 its reverse (11112112022112), we get a palindrome (32234133143223).

The spelling of 21122021121111 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, one hundred twenty-one thousand, one hundred eleven".