21220332412 has 12 divisors (see below), whose sum is σ = 38333503936. Its totient is φ = 10267902720.

The previous prime is 21220332359. The next prime is 21220332431. The reversal of 21220332412 is 21423302212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85565733 + ... + 85565980.

Almost surely, 2^21220332412 is an apocalyptic number.

It is an amenable number.

21220332412 is a deficient number, since it is larger than the sum of its proper divisors (17113171524).

21220332412 is a wasteful number, since it uses less digits than its factorization.

21220332412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171131748 (or 171131746 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220332412 its reverse (21423302212), we get a palindrome (42643634624).

The spelling of 21220332412 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-two thousand, four hundred twelve".