21077131076 has 6 divisors (see below), whose sum is σ = 36884979390. Its totient is φ = 10538565536.

The previous prime is 21077131073. The next prime is 21077131111. The reversal of 21077131076 is 67013177012.

It can be written as a sum of positive squares in only one way, i.e., 13151502400 + 7925628676 = 114680^2 + 89026^2 .

It is not an unprimeable number, because it can be changed into a prime (21077131073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634641381 + ... + 2634641388.

It is an arithmetic number, because the mean of its divisors is an integer number (6147496565).

Almost surely, 2^21077131076 is an apocalyptic number.

It is an amenable number.

21077131076 is a deficient number, since it is larger than the sum of its proper divisors (15807848314).

21077131076 is a wasteful number, since it uses less digits than its factorization.

21077131076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269282773 (or 5269282771 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The spelling of 21077131076 in words is "twenty-one billion, seventy-seven million, one hundred thirty-one thousand, seventy-six".