21021210312331 has 8 divisors (see below), whose sum is σ = 21380134224960. Its totient is φ = 20662374140232.

The previous prime is 21021210312293. The next prime is 21021210312391. The reversal of 21021210312331 is 13321301212012.

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 21021210312331 - 2¹¹ = 21021210310283 is a prime.

It is a super-2 number, since 2×21021210312331² (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 (21021210312391) 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, 21451785 + ... + 22410298.

It is an arithmetic number, because the mean of its divisors is an integer number (2672516778120).

Almost surely, 2^{21021210312331} is an apocalyptic number.

21021210312331 is a deficient number, since it is larger than the sum of its proper divisors (358923912629).

21021210312331 is an equidigital number, since it uses as much as digits as its factorization.

21021210312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43870265.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21021210312331 its reverse (13321301212012), we get a palindrome (34342511524343).

The spelling of 21021210312331 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, three hundred twelve thousand, three hundred thirty-one".