21121122022111 has 4 divisors (see below), whose sum is σ = 21132928129000. Its totient is φ = 21109315915224.

The previous prime is 21121122022081. The next prime is 21121122022127. The reversal of 21121122022111 is 11122022112112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121122022111 - 2⁵ = 21121122022079 is a prime.

It is a super-2 number, since 2×21121122022111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121122020111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5903050761 + ... + 5903054338.

It is an arithmetic number, because the mean of its divisors is an integer number (5283232032250).

Almost surely, 2^{21121122022111} is an apocalyptic number.

21121122022111 is a deficient number, since it is larger than the sum of its proper divisors (11806106889).

21121122022111 is a wasteful number, since it uses less digits than its factorization.

21121122022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11806106888.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121122022111 its reverse (11122022112112), we get a palindrome (32243144134223).

Subtracting from 21121122022111 its reverse (11122022112112), we obtain a palindrome (9999099909999).

The spelling of 21121122022111 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, twenty-two thousand, one hundred eleven".