21164450626 has 32 divisors (see below), whose sum is σ = 36687827520. Its totient is φ = 9055800000.

The previous prime is 21164450597. The next prime is 21164450639. The reversal of 21164450626 is 62605446112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95625 + ... + 226876.

It is an arithmetic number, because the mean of its divisors is an integer number (1146494610).

Almost surely, 2^21164450626 is an apocalyptic number.

21164450626 is a deficient number, since it is larger than the sum of its proper divisors (15523376894).

21164450626 is a wasteful number, since it uses less digits than its factorization.

21164450626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322690.

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21164450626 its reverse (62605446112), we get a palindrome (83769896738).

The spelling of 21164450626 in words is "twenty-one billion, one hundred sixty-four million, four hundred fifty thousand, six hundred twenty-six".