21377609474 has 8 divisors (see below), whose sum is σ = 34533061500. Its totient is φ = 9866588976.

The previous prime is 21377609459. The next prime is 21377609483. The reversal of 21377609474 is 47490677312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18606324025 + 2771285449 = 136405^2 + 52643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411107849 + ... + 411107900.

Almost surely, 2^21377609474 is an apocalyptic number.

21377609474 is a deficient number, since it is larger than the sum of its proper divisors (13155452026).

21377609474 is a wasteful number, since it uses less digits than its factorization.

21377609474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822215764.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 21377609474 in words is "twenty-one billion, three hundred seventy-seven million, six hundred nine thousand, four hundred seventy-four".