21359486 has 16 divisors (see below), whose sum is σ = 33447600. Its totient is φ = 10217088.

The previous prime is 21359461. The next prime is 21359489. The reversal of 21359486 is 68495312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4925 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (2090475).

Almost surely, 2^21359486 is an apocalyptic number.

21359486 is a deficient number, since it is larger than the sum of its proper divisors (12088114).

21359486 is a wasteful number, since it uses less digits than its factorization.

21359486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403.

The product of its digits is 51840, while the sum is 38.

The square root of 21359486 is about 4621.6323955936. The cubic root of 21359486 is about 277.4577962493.

The spelling of 21359486 in words is "twenty-one million, three hundred fifty-nine thousand, four hundred eighty-six".