21552303409 has 32 divisors (see below), whose sum is σ = 27461790720. Its totient is φ = 16460692992.

The previous prime is 21552303407. The next prime is 21552303413. The reversal of 21552303409 is 90430325512.

It is a cyclic number.

It is not a de Polignac number, because 21552303409 - 2¹ = 21552303407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21552303407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277707 + ... + 346735.

It is an arithmetic number, because the mean of its divisors is an integer number (858180960).

Almost surely, 2^21552303409 is an apocalyptic number.

It is an amenable number.

21552303409 is a deficient number, since it is larger than the sum of its proper divisors (5909487311).

21552303409 is a wasteful number, since it uses less digits than its factorization.

21552303409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69169.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 21552303409 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred nine".