21496836 has 12 divisors (see below), whose sum is σ = 50159312. Its totient is φ = 7165608.

The previous prime is 21496819. The next prime is 21496841. The reversal of 21496836 is 63869412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21496836² = 924227916021792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21496794 and 21496803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895690 + ... + 895713.

Almost surely, 2^21496836 is an apocalyptic number.

It is an amenable number.

21496836 is an abundant number, since it is smaller than the sum of its proper divisors (28662476).

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

21496836 is a wasteful number, since it uses less digits than its factorization.

21496836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791410 (or 1791408 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 21496836 is about 4636.4680523002. The cubic root of 21496836 is about 278.0512473886.

The spelling of 21496836 in words is "twenty-one million, four hundred ninety-six thousand, eight hundred thirty-six".