21011020011023 has 64 divisors (see below), whose sum is σ = 24521767649280. Its totient is φ = 17633177452800.

The previous prime is 21011020010957. The next prime is 21011020011049. The reversal of 21011020011023 is 32011002011012.

It is not a de Polignac number, because 21011020011023 - 2²² = 21011015816719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011020010989 and 21011020011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011020011083) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27609749963 + ... + 27609750723.

It is an arithmetic number, because the mean of its divisors is an integer number (383152619520).

Almost surely, 2^{21011020011023} is an apocalyptic number.

21011020011023 is a deficient number, since it is larger than the sum of its proper divisors (3510747638257).

21011020011023 is a wasteful number, since it uses less digits than its factorization.

21011020011023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21011020011023 its reverse (32011002011012), we get a palindrome (53022022022035).

The spelling of 21011020011023 in words is "twenty-one trillion, eleven billion, twenty million, eleven thousand, twenty-three".