21790006626 has 64 divisors (see below), whose sum is σ = 47299201920. Its totient is φ = 6668697600.

The previous prime is 21790006597. The next prime is 21790006633. The reversal of 21790006626 is 62660009712.

It is a super-2 number, since 2×21790006626² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1073976 + ... + 1094076.

It is an arithmetic number, because the mean of its divisors is an integer number (739050030).

Almost surely, 2^21790006626 is an apocalyptic number.

21790006626 is an abundant number, since it is smaller than the sum of its proper divisors (25509195294).

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

21790006626 is a wasteful number, since it uses less digits than its factorization.

21790006626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20419.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 21790006626 in words is "twenty-one billion, seven hundred ninety million, six thousand, six hundred twenty-six".