21002130112031 has 16 divisors (see below), whose sum is σ = 21703694164416. Its totient is φ = 20307849440256.

The previous prime is 21002130112027. The next prime is 21002130112043. The reversal of 21002130112031 is 13021103120012.

It is a cyclic number.

It is not a de Polignac number, because 21002130112031 - 2² = 21002130112027 is a prime.

It is a super-2 number, since 2×21002130112031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002130112331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4841135 + ... + 8089551.

It is an arithmetic number, because the mean of its divisors is an integer number (1356480885276).

Almost surely, 2^{21002130112031} is an apocalyptic number.

21002130112031 is a deficient number, since it is larger than the sum of its proper divisors (701564052385).

21002130112031 is a wasteful number, since it uses less digits than its factorization.

21002130112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249538.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21002130112031 its reverse (13021103120012), we get a palindrome (34023233232043).

The spelling of 21002130112031 in words is "twenty-one trillion, two billion, one hundred thirty million, one hundred twelve thousand, thirty-one".