21936516 has 36 divisors (see below), whose sum is σ = 59543568. Its totient is φ = 6267408.

The previous prime is 21936487. The next prime is 21936521. The reversal of 21936516 is 61563912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18066 + ... + 19241.

It is an arithmetic number, because the mean of its divisors is an integer number (1653988).

Almost surely, 2^21936516 is an apocalyptic number.

It is an amenable number.

21936516 is an abundant number, since it is smaller than the sum of its proper divisors (37607052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21936516 is a wasteful number, since it uses less digits than its factorization.

21936516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37328 (or 37319 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 21936516 is about 4683.6434535519. The cubic root of 21936516 is about 279.9341511819.

The spelling of 21936516 in words is "twenty-one million, nine hundred thirty-six thousand, five hundred sixteen".