21700626 has 16 divisors (see below), whose sum is σ = 43447104. Its totient is φ = 7225904.

The previous prime is 21700621. The next prime is 21700631. The reversal of 21700626 is 62600712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21700621) and next prime (21700631).

It is a junction number, because it is equal to n+sod(n) for n = 21700596 and 21700605.

It is not an unprimeable number, because it can be changed into a prime (21700621) 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, 9355 + ... + 11441.

It is an arithmetic number, because the mean of its divisors is an integer number (2715444).

Almost surely, 2^21700626 is an apocalyptic number.

21700626 is an abundant number, since it is smaller than the sum of its proper divisors (21746478).

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

21700626 is a wasteful number, since it uses less digits than its factorization.

21700626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21700626 is about 4658.3930705770. The cubic root of 21700626 is about 278.9271273303.

The spelling of 21700626 in words is "twenty-one million, seven hundred thousand, six hundred twenty-six".