21486492 has 96 divisors (see below), whose sum is σ = 60435200. Its totient is φ = 6578496.

The previous prime is 21486467. The next prime is 21486523. The reversal of 21486492 is 29468412.

21486492 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 649 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75783 + ... + 76065.

Almost surely, 2^21486492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21486492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30217600).

21486492 is an abundant number, since it is smaller than the sum of its proper divisors (38948708).

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

21486492 is a wasteful number, since it uses less digits than its factorization.

21486492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 344 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21486492 is about 4635.3524137869. The cubic root of 21486492 is about 278.0066420096.

The spelling of 21486492 in words is "twenty-one million, four hundred eighty-six thousand, four hundred ninety-two".