21655031000331 has 8 divisors (see below), whose sum is σ = 28873409232384. Its totient is φ = 14436670050920.

The previous prime is 21655031000311. The next prime is 21655031000347. The reversal of 21655031000331 is 13300013055612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21655031000331 - 2²² = 21655026806027 is a prime.

It is a super-2 number, since 2×21655031000331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21655031000311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041471 + ... + 6662936.

It is an arithmetic number, because the mean of its divisors is an integer number (3609176154048).

Almost surely, 2^{21655031000331} is an apocalyptic number.

21655031000331 is a deficient number, since it is larger than the sum of its proper divisors (7218378232053).

21655031000331 is an equidigital number, since it uses as much as digits as its factorization.

21655031000331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8641321.

The product of its (nonzero) digits is 8100, while the sum is 30.

Adding to 21655031000331 its reverse (13300013055612), we get a palindrome (34955044055943).

The spelling of 21655031000331 in words is "twenty-one trillion, six hundred fifty-five billion, thirty-one million, three hundred thirty-one", and thus it is an aban number.