21201223120331 has 16 divisors (see below), whose sum is σ = 21350756044800. Its totient is φ = 21052232688960.

The previous prime is 21201223120291. The next prime is 21201223120333. The reversal of 21201223120331 is 13302132210212.

It is a cyclic number.

It is not a de Polignac number, because 21201223120331 - 2⁶ = 21201223120267 is a prime.

It is a super-2 number, since 2×21201223120331² (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 = 21201223120297 and 21201223120306.

It is not an unprimeable number, because it can be changed into a prime (21201223120333) 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, 240870776 + ... + 240958778.

It is an arithmetic number, because the mean of its divisors is an integer number (1334422252800).

Almost surely, 2^{21201223120331} is an apocalyptic number.

21201223120331 is a deficient number, since it is larger than the sum of its proper divisors (149532924469).

21201223120331 is a wasteful number, since it uses less digits than its factorization.

21201223120331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91066.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21201223120331 its reverse (13302132210212), we get a palindrome (34503355330543).

The spelling of 21201223120331 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-three million, one hundred twenty thousand, three hundred thirty-one".