21689576770 has 16 divisors (see below), whose sum is σ = 39576051000. Its totient is φ = 8556983424.

The previous prime is 21689576767. The next prime is 21689576773. The reversal of 21689576770 is 7767598612.

It is an interprime number because it is at equal distance from previous prime (21689576767) and next prime (21689576773).

It can be written as a sum of positive squares in 4 ways, for example, as 21111799401 + 577777369 = 145299^2 + 24037^2 .

It is not an unprimeable number, because it can be changed into a prime (21689576773) 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, 14855145 + ... + 14856604.

Almost surely, 2^21689576770 is an apocalyptic number.

21689576770 is a deficient number, since it is larger than the sum of its proper divisors (17886474230).

21689576770 is a wasteful number, since it uses less digits than its factorization.

21689576770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29711829.

The product of its (nonzero) digits is 8890560, while the sum is 58.

The spelling of 21689576770 in words is "twenty-one billion, six hundred eighty-nine million, five hundred seventy-six thousand, seven hundred seventy".