21335501564 has 12 divisors (see below), whose sum is σ = 40209214584. Its totient is φ = 9847154544.

The previous prime is 21335501501. The next prime is 21335501591. The reversal of 21335501564 is 46510553312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205149002 + ... + 205149105.

It is an arithmetic number, because the mean of its divisors is an integer number (3350767882).

Almost surely, 2^21335501564 is an apocalyptic number.

It is an amenable number.

21335501564 is a deficient number, since it is larger than the sum of its proper divisors (18873713020).

21335501564 is a wasteful number, since it uses less digits than its factorization.

21335501564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410298124 (or 410298122 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 21335501564 in words is "twenty-one billion, three hundred thirty-five million, five hundred one thousand, five hundred sixty-four".