21021331002131 has 4 divisors (see below), whose sum is σ = 21022293583200. Its totient is φ = 21020368421064.

The previous prime is 21021331002079. The next prime is 21021331002137. The reversal of 21021331002131 is 13120013312012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21021331002131 - 2²² = 21021326807827 is a prime.

It is a super-2 number, since 2×21021331002131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021331002137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481257776 + ... + 481301453.

It is an arithmetic number, because the mean of its divisors is an integer number (5255573395800).

Almost surely, 2^{21021331002131} is an apocalyptic number.

21021331002131 is a deficient number, since it is larger than the sum of its proper divisors (962581069).

21021331002131 is an equidigital number, since it uses as much as digits as its factorization.

21021331002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962581068.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21021331002131 its reverse (13120013312012), we get a palindrome (34141344314143).

The spelling of 21021331002131 in words is "twenty-one trillion, twenty-one billion, three hundred thirty-one million, two thousand, one hundred thirty-one".