21023120213504 has 40 divisors (see below), whose sum is σ = 43453634146560. Its totient is φ = 10149092509696.

The previous prime is 21023120213497. The next prime is 21023120213531. The reversal of 21023120213504 is 40531202132012.

It is a super-2 number, since 2×21023120213504² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707929664 + ... + 707959359.

It is an arithmetic number, because the mean of its divisors is an integer number (1086340853664).

Almost surely, 2^{21023120213504} is an apocalyptic number.

It is an amenable number.

21023120213504 is an abundant number, since it is smaller than the sum of its proper divisors (22430513933056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21023120213504 is an equidigital number, since it uses as much as digits as its factorization.

21023120213504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415889070 (or 1415889054 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21023120213504 its reverse (40531202132012), we get a palindrome (61554322345516).

The spelling of 21023120213504 in words is "twenty-one trillion, twenty-three billion, one hundred twenty million, two hundred thirteen thousand, five hundred four".