21277056730 has 16 divisors (see below), whose sum is σ = 38312140104. Its totient is φ = 8507836480.

The previous prime is 21277056701. The next prime is 21277056761. The reversal of 21277056730 is 3765077212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17773955761 + 3503100969 = 133319^2 + 59187^2 .

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, 343237 + ... + 400456.

Almost surely, 2^21277056730 is an apocalyptic number.

21277056730 is a deficient number, since it is larger than the sum of its proper divisors (17035083374).

21277056730 is a wasteful number, since it uses less digits than its factorization.

21277056730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746561.

The product of its (nonzero) digits is 123480, while the sum is 40.

The spelling of 21277056730 in words is "twenty-one billion, two hundred seventy-seven million, fifty-six thousand, seven hundred thirty".