21072777590 has 48 divisors (see below), whose sum is σ = 38850806304. Its totient is φ = 8229436800.

The previous prime is 21072777577. The next prime is 21072777611. The reversal of 21072777590 is 9577727012.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11507975 + ... + 11509805.

It is an arithmetic number, because the mean of its divisors is an integer number (809391798).

Almost surely, 2^21072777590 is an apocalyptic number.

21072777590 is a deficient number, since it is larger than the sum of its proper divisors (17778028714).

21072777590 is a wasteful number, since it uses less digits than its factorization.

21072777590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453 (or 2406 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 47.

The spelling of 21072777590 in words is "twenty-one billion, seventy-two million, seven hundred seventy-seven thousand, five hundred ninety".