21031012321331 has 16 divisors (see below), whose sum is σ = 22991908239360. Its totient is φ = 19150838951040.

The previous prime is 21031012321309. The next prime is 21031012321337. The reversal of 21031012321331 is 13312321013012.

It is a cyclic number.

It is not a de Polignac number, because 21031012321331 - 2¹⁴ = 21031012304947 is a prime.

It is a super-2 number, since 2×21031012321331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031012321297 and 21031012321306.

It is not an unprimeable number, because it can be changed into a prime (21031012321337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2506031 + ... + 6952856.

It is an arithmetic number, because the mean of its divisors is an integer number (1436994264960).

Almost surely, 2^{21031012321331} is an apocalyptic number.

21031012321331 is a deficient number, since it is larger than the sum of its proper divisors (1960895918029).

21031012321331 is a wasteful number, since it uses less digits than its factorization.

21031012321331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9463154.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21031012321331 its reverse (13312321013012), we get a palindrome (34343333334343).

The spelling of 21031012321331 in words is "twenty-one trillion, thirty-one billion, twelve million, three hundred twenty-one thousand, three hundred thirty-one".