21000320122331 has 16 divisors (see below), whose sum is σ = 23087071190400. Its totient is φ = 18943326792000.

The previous prime is 21000320122319. The next prime is 21000320122357. The reversal of 21000320122331 is 13322102300012.

It is a cyclic number.

It is not a de Polignac number, because 21000320122331 - 2⁴² = 16602273611227 is a prime.

It is a super-2 number, since 2×21000320122331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000320122381) 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, 1059341 + ... + 6566798.

It is an arithmetic number, because the mean of its divisors is an integer number (1442941949400).

Almost surely, 2^{21000320122331} is an apocalyptic number.

21000320122331 is a deficient number, since it is larger than the sum of its proper divisors (2086751068069).

21000320122331 is a wasteful number, since it uses less digits than its factorization.

21000320122331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628090.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21000320122331 its reverse (13322102300012), we get a palindrome (34322422422343).

The spelling of 21000320122331 in words is "twenty-one trillion, three hundred twenty million, one hundred twenty-two thousand, three hundred thirty-one".