21031101301031 has 4 divisors (see below), whose sum is σ = 22268224906992. Its totient is φ = 19793977695072.

The previous prime is 21031101301019. The next prime is 21031101301129. The reversal of 21031101301031 is 13010310113012.

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 21031101301031 - 2²⁶ = 21031034192167 is a prime.

It is a super-2 number, since 2×21031101301031² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1237123605943 = 21031101301031 / (2 + 1 + 0 + 3 + 1 + 1 + 0 + 1 + 3 + 0 + 1 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031101201031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618561802955 + ... + 618561802988.

It is an arithmetic number, because the mean of its divisors is an integer number (5567056226748).

Almost surely, 2^{21031101301031} is an apocalyptic number.

21031101301031 is a deficient number, since it is larger than the sum of its proper divisors (1237123605961).

21031101301031 is a wasteful number, since it uses less digits than its factorization.

21031101301031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237123605960.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21031101301031 its reverse (13010310113012), we get a palindrome (34041411414043).

The spelling of 21031101301031 in words is "twenty-one trillion, thirty-one billion, one hundred one million, three hundred one thousand, thirty-one".