21312112130331 has 16 divisors (see below), whose sum is σ = 31004390487168. Its totient is φ = 12914367152000.

The previous prime is 21312112130321. The next prime is 21312112130399. The reversal of 21312112130331 is 13303121121312.

It is a cyclic number.

It is not a de Polignac number, because 21312112130331 - 2¹³ = 21312112122139 is a prime.

It is a super-2 number, since 2×21312112130331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312112130321) 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, 51401445 + ... + 51814406.

It is an arithmetic number, because the mean of its divisors is an integer number (1937774405448).

Almost surely, 2^{21312112130331} is an apocalyptic number.

21312112130331 is a deficient number, since it is larger than the sum of its proper divisors (9692278356837).

21312112130331 is a wasteful number, since it uses less digits than its factorization.

21312112130331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103222122.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21312112130331 its reverse (13303121121312), we get a palindrome (34615233251643).

The spelling of 21312112130331 in words is "twenty-one trillion, three hundred twelve billion, one hundred twelve million, one hundred thirty thousand, three hundred thirty-one".