21021001030131 has 4 divisors (see below), whose sum is σ = 28028001373512. Its totient is φ = 14014000686752.

The previous prime is 21021001030093. The next prime is 21021001030207. The reversal of 21021001030131 is 13103010012012.

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 21021001030131 - 2⁶ = 21021001030067 is a prime.

It is a super-2 number, since 2×21021001030131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021001030131.

It is not an unprimeable number, because it can be changed into a prime (21021001030831) 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, 3503500171686 + ... + 3503500171691.

It is an arithmetic number, because the mean of its divisors is an integer number (7007000343378).

Almost surely, 2^{21021001030131} is an apocalyptic number.

21021001030131 is a deficient number, since it is larger than the sum of its proper divisors (7007000343381).

21021001030131 is an equidigital number, since it uses as much as digits as its factorization.

21021001030131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007000343380.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21021001030131 its reverse (13103010012012), we get a palindrome (34124011042143).

The spelling of 21021001030131 in words is "twenty-one trillion, twenty-one billion, one million, thirty thousand, one hundred thirty-one".