21201321221331 has 8 divisors (see below), whose sum is σ = 29756240310720. Its totient is φ = 13390308139752.

The previous prime is 21201321221329. The next prime is 21201321221351. The reversal of 21201321221331 is 13312212310212.

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

It is not a de Polignac number, because 21201321221331 - 2¹ = 21201321221329 is a prime.

It is a super-2 number, since 2×21201321221331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201321221351) 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, 185976501885 + ... + 185976501998.

It is an arithmetic number, because the mean of its divisors is an integer number (3719530038840).

Almost surely, 2^{21201321221331} is an apocalyptic number.

21201321221331 is a deficient number, since it is larger than the sum of its proper divisors (8554919089389).

21201321221331 is a wasteful number, since it uses less digits than its factorization.

21201321221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371953003905.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21201321221331 its reverse (13312212310212), we get a palindrome (34513533531543).

The spelling of 21201321221331 in words is "twenty-one trillion, two hundred one billion, three hundred twenty-one million, two hundred twenty-one thousand, three hundred thirty-one".