21865062 has 16 divisors (see below), whose sum is σ = 43776000. Its totient is φ = 7280712.

The previous prime is 21865057. The next prime is 21865091. The reversal of 21865062 is 26056812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9939 + ... + 11937.

It is an arithmetic number, because the mean of its divisors is an integer number (2736000).

Almost surely, 2^21865062 is an apocalyptic number.

21865062 is an abundant number, since it is smaller than the sum of its proper divisors (21910938).

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

21865062 is a wasteful number, since it uses less digits than its factorization.

21865062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3827.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21865062 is about 4676.0091958849. The cubic root of 21865062 is about 279.6298766071.

The spelling of 21865062 in words is "twenty-one million, eight hundred sixty-five thousand, sixty-two".