21860161626 has 16 divisors (see below), whose sum is σ = 44461346400. Its totient is φ = 7163216688.

The previous prime is 21860161601. The next prime is 21860161669. The reversal of 21860161626 is 62616106812.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30875581 + ... + 30876288.

It is an arithmetic number, because the mean of its divisors is an integer number (2778834150).

Almost surely, 2^21860161626 is an apocalyptic number.

21860161626 is an abundant number, since it is smaller than the sum of its proper divisors (22601184774).

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

21860161626 is a wasteful number, since it uses less digits than its factorization.

21860161626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61751933.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 21860161626 in words is "twenty-one billion, eight hundred sixty million, one hundred sixty-one thousand, six hundred twenty-six".