21413626 has 8 divisors (see below), whose sum is σ = 34591284. Its totient is φ = 9883200.

The previous prime is 21413617. The next prime is 21413641. The reversal of 21413626 is 62631412.

It can be written as a sum of positive squares in 2 ways, for example, as 16008001 + 5405625 = 4001^2 + 2325^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21413626.

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, 411775 + ... + 411826.

Almost surely, 2^21413626 is an apocalyptic number.

21413626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21413626 is a deficient number, since it is larger than the sum of its proper divisors (13177658).

21413626 is a wasteful number, since it uses less digits than its factorization.

21413626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823616.

The product of its digits is 1728, while the sum is 25.

The square root of 21413626 is about 4627.4859265048. The cubic root of 21413626 is about 277.6920230340.

The spelling of 21413626 in words is "twenty-one million, four hundred thirteen thousand, six hundred twenty-six".