21860396 has 18 divisors (see below), whose sum is σ = 39995172. Its totient is φ = 10453960.

The previous prime is 21860389. The next prime is 21860401. The reversal of 21860396 is 69306812.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3050 + ... + 7281.

It is an arithmetic number, because the mean of its divisors is an integer number (2221954).

Almost surely, 2^21860396 is an apocalyptic number.

It is an amenable number.

21860396 is a deficient number, since it is larger than the sum of its proper divisors (18134776).

21860396 is a wasteful number, since it uses less digits than its factorization.

21860396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10381 (or 10356 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21860396 is about 4675.5102395354. The cubic root of 21860396 is about 279.6099842048.

The spelling of 21860396 in words is "twenty-one million, eight hundred sixty thousand, three hundred ninety-six".