21577864467 has 8 divisors (see below), whose sum is σ = 29067089296. Its totient is φ = 14236941312.

The previous prime is 21577864459. The next prime is 21577864481. The reversal of 21577864467 is 76446877512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21577864467 - 2³ = 21577864459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21577864487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37075078 + ... + 37075659.

It is an arithmetic number, because the mean of its divisors is an integer number (3633386162).

Almost surely, 2^21577864467 is an apocalyptic number.

21577864467 is a deficient number, since it is larger than the sum of its proper divisors (7489224829).

21577864467 is an equidigital number, since it uses as much as digits as its factorization.

21577864467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74150837.

The product of its digits is 15805440, while the sum is 57.

The spelling of 21577864467 in words is "twenty-one billion, five hundred seventy-seven million, eight hundred sixty-four thousand, four hundred sixty-seven".