21073626 has 36 divisors (see below), whose sum is σ = 53116362. Its totient is φ = 6020784.

The previous prime is 21073579. The next prime is 21073627. The reversal of 21073626 is 62637012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 7568001 = 3675^2 + 2751^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21073626.

It is not an unprimeable number, because it can be changed into a prime (21073627) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11065 + ... + 12828.

Almost surely, 2^21073626 is an apocalyptic number.

21073626 is an abundant number, since it is smaller than the sum of its proper divisors (32042736).

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

21073626 is a wasteful number, since it uses less digits than its factorization.

21073626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23915 (or 23905 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21073626 is about 4590.6019213171. The cubic root of 21073626 is about 276.2144678336.

The spelling of 21073626 in words is "twenty-one million, seventy-three thousand, six hundred twenty-six".