21861496 has 16 divisors (see below), whose sum is σ = 41205600. Its totient is φ = 10873344.

The previous prime is 21861481. The next prime is 21861517. The reversal of 21861496 is 69416812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5536 + ... + 8623.

It is an arithmetic number, because the mean of its divisors is an integer number (2575350).

Almost surely, 2^21861496 is an apocalyptic number.

It is an amenable number.

21861496 is a deficient number, since it is larger than the sum of its proper divisors (19344104).

21861496 is a wasteful number, since it uses less digits than its factorization.

21861496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14358 (or 14354 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 21861496 is about 4675.6278722756. The cubic root of 21861496 is about 279.6146740531.

The spelling of 21861496 in words is "twenty-one million, eight hundred sixty-one thousand, four hundred ninety-six".