21139626 has 16 divisors (see below), whose sum is σ = 42438528. Its totient is φ = 7020000.

The previous prime is 21139621. The next prime is 21139627. The reversal of 21139626 is 62693112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21139593 and 21139602.

It is not an unprimeable number, because it can be changed into a prime (21139621) 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, 4875 + ... + 8126.

It is an arithmetic number, because the mean of its divisors is an integer number (2652408).

Almost surely, 2^21139626 is an apocalyptic number.

21139626 is an abundant number, since it is smaller than the sum of its proper divisors (21298902).

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

21139626 is a wasteful number, since it uses less digits than its factorization.

21139626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13277.

The product of its digits is 3888, while the sum is 30.

The square root of 21139626 is about 4597.7849014498. The cubic root of 21139626 is about 276.5025238835.

The spelling of 21139626 in words is "twenty-one million, one hundred thirty-nine thousand, six hundred twenty-six".