21000131232031 has 4 divisors (see below), whose sum is σ = 24000149979472. Its totient is φ = 18000112484592.

The previous prime is 21000131232013. The next prime is 21000131232083. The reversal of 21000131232031 is 13023213100012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21000131232031 is a prime.

It is a super-2 number, since 2×21000131232031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000131532031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500009373710 + ... + 1500009373723.

It is an arithmetic number, because the mean of its divisors is an integer number (6000037494868).

Almost surely, 2^{21000131232031} is an apocalyptic number.

21000131232031 is a deficient number, since it is larger than the sum of its proper divisors (3000018747441).

21000131232031 is an equidigital number, since it uses as much as digits as its factorization.

21000131232031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000018747440.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21000131232031 its reverse (13023213100012), we get a palindrome (34023344332043).

The spelling of 21000131232031 in words is "twenty-one trillion, one hundred thirty-one million, two hundred thirty-two thousand, thirty-one".