21552346438 has 32 divisors (see below), whose sum is σ = 37660536576. Its totient is φ = 9058459488.

The previous prime is 21552346433. The next prime is 21552346447. The reversal of 21552346438 is 83464325512.

21552346438 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21552346394 and 21552346403.

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, 2193645 + ... + 2203447.

It is an arithmetic number, because the mean of its divisors is an integer number (1176891768).

Almost surely, 2^21552346438 is an apocalyptic number.

21552346438 is a deficient number, since it is larger than the sum of its proper divisors (16108190138).

21552346438 is a wasteful number, since it uses less digits than its factorization.

21552346438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12828.

The product of its digits is 691200, while the sum is 43.

The spelling of 21552346438 in words is "twenty-one billion, five hundred fifty-two million, three hundred forty-six thousand, four hundred thirty-eight".