21387613076 has 12 divisors (see below), whose sum is σ = 37429348320. Its totient is φ = 10693513560.

The previous prime is 21387613063. The next prime is 21387613081. The reversal of 21387613076 is 67031678312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237305 + ... + 314783.

It is an arithmetic number, because the mean of its divisors is an integer number (3119112360).

Almost surely, 2^21387613076 is an apocalyptic number.

It is an amenable number.

21387613076 is a deficient number, since it is larger than the sum of its proper divisors (16041735244).

21387613076 is a wasteful number, since it uses less digits than its factorization.

21387613076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146494 (or 146492 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21387613076 in words is "twenty-one billion, three hundred eighty-seven million, six hundred thirteen thousand, seventy-six".