21917779527 has 48 divisors (see below), whose sum is σ = 34406622720. Its totient is φ = 12373425792.

The previous prime is 21917779493. The next prime is 21917779547. The reversal of 21917779527 is 72597771912.

It is not a de Polignac number, because 21917779527 - 2¹² = 21917775431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917779547) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 6431458 + ... + 6434864.

It is an arithmetic number, because the mean of its divisors is an integer number (716804640).

Almost surely, 2^21917779527 is an apocalyptic number.

21917779527 is a deficient number, since it is larger than the sum of its proper divisors (12488843193).

21917779527 is a wasteful number, since it uses less digits than its factorization.

21917779527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940 (or 3933 counting only the distinct ones).

The product of its digits is 3889620, while the sum is 57.

The spelling of 21917779527 in words is "twenty-one billion, nine hundred seventeen million, seven hundred seventy-nine thousand, five hundred twenty-seven".