21320100001031 has 16 divisors (see below), whose sum is σ = 22997180058720. Its totient is φ = 19648325537280.

The previous prime is 21320100000967. The next prime is 21320100001051. The reversal of 21320100001031 is 13010000102312.

It is a cyclic number.

It is not a de Polignac number, because 21320100001031 - 2⁶ = 21320100000967 is a prime.

It is a super-2 number, since 2×21320100001031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320100000997 and 21320100001015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320100001051) 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, 54358355 + ... + 54749163.

It is an arithmetic number, because the mean of its divisors is an integer number (1437323753670).

Almost surely, 2^{21320100001031} is an apocalyptic number.

21320100001031 is a deficient number, since it is larger than the sum of its proper divisors (1677080057689).

21320100001031 is a wasteful number, since it uses less digits than its factorization.

21320100001031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397586.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21320100001031 its reverse (13010000102312), we get a palindrome (34330100103343).

The spelling of 21320100001031 in words is "twenty-one trillion, three hundred twenty billion, one hundred million, one thousand, thirty-one".