21201310122031 has 4 divisors (see below), whose sum is σ = 22832180131432. Its totient is φ = 19570440112632.

The previous prime is 21201310122019. The next prime is 21201310122043. The reversal of 21201310122031 is 13022101310212.

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

It is an interprime number because it is at equal distance from previous prime (21201310122019) and next prime (21201310122043).

It is a cyclic number.

It is not a de Polignac number, because 21201310122031 - 2¹⁵ = 21201310089263 is a prime.

It is a super-2 number, since 2×21201310122031² (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 (21201310122011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815435004681 + ... + 815435004706.

It is an arithmetic number, because the mean of its divisors is an integer number (5708045032858).

Almost surely, 2^{21201310122031} is an apocalyptic number.

21201310122031 is a deficient number, since it is larger than the sum of its proper divisors (1630870009401).

21201310122031 is a wasteful number, since it uses less digits than its factorization.

21201310122031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630870009400.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21201310122031 its reverse (13022101310212), we get a palindrome (34223411432243).

The spelling of 21201310122031 in words is "twenty-one trillion, two hundred one billion, three hundred ten million, one hundred twenty-two thousand, thirty-one".