21220111023 has 8 divisors (see below), whose sum is σ = 28395625008. Its totient is φ = 14095668864.

The previous prime is 21220110971. The next prime is 21220111027. The reversal of 21220111023 is 32011102212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220111023 - 2⁸ = 21220110767 is a prime.

It is a super-2 number, since 2×21220111023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220110993 and 21220111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12766986 + ... + 12768647.

It is an arithmetic number, because the mean of its divisors is an integer number (3549453126).

Almost surely, 2^21220111023 is an apocalyptic number.

21220111023 is a deficient number, since it is larger than the sum of its proper divisors (7175513985).

21220111023 is a wasteful number, since it uses less digits than its factorization.

21220111023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25535913.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21220111023 its reverse (32011102212), we get a palindrome (53231213235).

The spelling of 21220111023 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, twenty-three".