21464374291 has 4 divisors (see below), whose sum is σ = 21464728272. Its totient is φ = 21464020312.

The previous prime is 21464374289. The next prime is 21464374319. The reversal of 21464374291 is 19247346412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21464374291 - 2¹ = 21464374289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21464374231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60460 + ... + 215833.

It is an arithmetic number, because the mean of its divisors is an integer number (5366182068).

Almost surely, 2^21464374291 is an apocalyptic number.

21464374291 is a deficient number, since it is larger than the sum of its proper divisors (353981).

21464374291 is an equidigital number, since it uses as much as digits as its factorization.

21464374291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353980.

The product of its digits is 290304, while the sum is 43.

The spelling of 21464374291 in words is "twenty-one billion, four hundred sixty-four million, three hundred seventy-four thousand, two hundred ninety-one".