21770623916 has 6 divisors (see below), whose sum is σ = 38098591860. Its totient is φ = 10885311956.

The previous prime is 21770623891. The next prime is 21770623969. The reversal of 21770623916 is 61932607712.

It is a super-2 number, since 2×21770623916² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2721327986 + ... + 2721327993.

It is an arithmetic number, because the mean of its divisors is an integer number (6349765310).

Almost surely, 2^21770623916 is an apocalyptic number.

It is an amenable number.

21770623916 is a deficient number, since it is larger than the sum of its proper divisors (16327967944).

21770623916 is a wasteful number, since it uses less digits than its factorization.

21770623916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5442655983 (or 5442655981 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 21770623916 in words is "twenty-one billion, seven hundred seventy million, six hundred twenty-three thousand, nine hundred sixteen".