21552346437 has 16 divisors (see below), whose sum is σ = 30952373760. Its totient is φ = 13295448432.

The previous prime is 21552346433. The next prime is 21552346447. The reversal of 21552346437 is 73464325512.

It is not a de Polignac number, because 21552346437 - 2² = 21552346433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552346433) 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, 4394193 + ... + 4399094.

It is an arithmetic number, because the mean of its divisors is an integer number (1934523360).

Almost surely, 2^21552346437 is an apocalyptic number.

It is an amenable number.

21552346437 is a deficient number, since it is larger than the sum of its proper divisors (9400027323).

21552346437 is a wasteful number, since it uses less digits than its factorization.

21552346437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8793352.

The product of its digits is 604800, while the sum is 42.

The spelling of 21552346437 in words is "twenty-one billion, five hundred fifty-two million, three hundred forty-six thousand, four hundred thirty-seven".