21270500776 has 64 divisors (see below), whose sum is σ = 49925030400. Its totient is φ = 8283835392.

The previous prime is 21270500749. The next prime is 21270500813. The reversal of 21270500776 is 67700507212.

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 15 ways as a sum of consecutive naturals, for example, 357616 + ... + 412831.

It is an arithmetic number, because the mean of its divisors is an integer number (780078600).

Almost surely, 2^21270500776 is an apocalyptic number.

It is an amenable number.

21270500776 is an abundant number, since it is smaller than the sum of its proper divisors (28654529624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21270500776 is a wasteful number, since it uses less digits than its factorization.

21270500776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770506 (or 770502 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The spelling of 21270500776 in words is "twenty-one billion, two hundred seventy million, five hundred thousand, seven hundred seventy-six".