21523648767 has 8 divisors (see below), whose sum is σ = 28701810096. Its totient is φ = 14347293312.

The previous prime is 21523648759. The next prime is 21523648777. The reversal of 21523648767 is 76784632512.

It is a happy number.

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

It is not a de Polignac number, because 21523648767 - 2³ = 21523648759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523648717) 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, 423408 + ... + 471509.

It is an arithmetic number, because the mean of its divisors is an integer number (3587726262).

Almost surely, 2^21523648767 is an apocalyptic number.

21523648767 is a deficient number, since it is larger than the sum of its proper divisors (7178161329).

21523648767 is an equidigital number, since it uses as much as digits as its factorization.

21523648767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902937.

The product of its digits is 3386880, while the sum is 51.

The spelling of 21523648767 in words is "twenty-one billion, five hundred twenty-three million, six hundred forty-eight thousand, seven hundred sixty-seven".