21837064 has 8 divisors (see below), whose sum is σ = 40944510. Its totient is φ = 10918528.

The previous prime is 21837059. The next prime is 21837073. The reversal of 21837064 is 46073812.

It can be written as a sum of positive squares in only one way, i.e., 11222500 + 10614564 = 3350^2 + 3258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364809 + ... + 1364824.

Almost surely, 2^21837064 is an apocalyptic number.

It is an amenable number.

21837064 is a deficient number, since it is larger than the sum of its proper divisors (19107446).

21837064 is a wasteful number, since it uses less digits than its factorization.

21837064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729639 (or 2729635 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21837064 is about 4673.0144446599. The cubic root of 21837064 is about 279.5104711777.

The spelling of 21837064 in words is "twenty-one million, eight hundred thirty-seven thousand, sixty-four".