21132032223221 has 8 divisors (see below), whose sum is σ = 22979825184600. Its totient is φ = 19351431733248.

The previous prime is 21132032223167. The next prime is 21132032223257. The reversal of 21132032223221 is 12232223023112.

It can be written as a sum of positive squares in 4 ways, for example, as 10480855882225 + 10651176340996 = 3237415^2 + 3263614^2 .

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 21132032223221 - 2¹⁸ = 21132031961077 is a prime.

It is a super-2 number, since 2×21132032223221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132032229221) 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, 16798117196 + ... + 16798118453.

It is an arithmetic number, because the mean of its divisors is an integer number (2872478148075).

Almost surely, 2^{21132032223221} is an apocalyptic number.

It is an amenable number.

21132032223221 is a deficient number, since it is larger than the sum of its proper divisors (1847792961379).

21132032223221 is a wasteful number, since it uses less digits than its factorization.

21132032223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33596235703.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21132032223221 its reverse (12232223023112), we get a palindrome (33364255246333).

The spelling of 21132032223221 in words is "twenty-one trillion, one hundred thirty-two billion, thirty-two million, two hundred twenty-three thousand, two hundred twenty-one".