21011012131203 has 64 divisors (see below), whose sum is σ = 31753207664640. Its totient is φ = 13727451801600.

The previous prime is 21011012131183. The next prime is 21011012131247. The reversal of 21011012131203 is 30213121011012.

21011012131203 is a `hidden beast` number, since 210 + 110 + 12 + 131 + 203 = 666.

It is not a de Polignac number, because 21011012131203 - 2¹⁰ = 21011012130179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011012131253) 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, 1601320483 + ... + 1601333603.

It is an arithmetic number, because the mean of its divisors is an integer number (496143869760).

Almost surely, 2^{21011012131203} is an apocalyptic number.

21011012131203 is a deficient number, since it is larger than the sum of its proper divisors (10742195533437).

21011012131203 is a wasteful number, since it uses less digits than its factorization.

21011012131203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16665 (or 16659 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21011012131203 its reverse (30213121011012), we get a palindrome (51224133142215).

The spelling of 21011012131203 in words is "twenty-one trillion, eleven billion, twelve million, one hundred thirty-one thousand, two hundred three".