21780254583 has 12 divisors (see below), whose sum is σ = 31461702168. Its totient is φ = 14519553840.

The previous prime is 21780254549. The next prime is 21780254621. The reversal of 21780254583 is 38545208712.

21780254583 is a `hidden beast` number, since 2 + 17 + 8 + 0 + 2 + 54 + 583 = 666.

It is not a de Polignac number, because 21780254583 - 2⁶ = 21780254519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21780254983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297241 + ... + 363197.

It is an arithmetic number, because the mean of its divisors is an integer number (2621808514).

Almost surely, 2^21780254583 is an apocalyptic number.

21780254583 is a deficient number, since it is larger than the sum of its proper divisors (9681447585).

21780254583 is a wasteful number, since it uses less digits than its factorization.

21780254583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102654 (or 102651 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 21780254583 in words is "twenty-one billion, seven hundred eighty million, two hundred fifty-four thousand, five hundred eighty-three".