21164454265 has 8 divisors (see below), whose sum is σ = 25419189888. Its totient is φ = 16917000240.

The previous prime is 21164454257. The next prime is 21164454281. The reversal of 21164454265 is 56245446112.

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

It is not a de Polignac number, because 21164454265 - 2³ = 21164454257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1814001 + ... + 1825630.

It is an arithmetic number, because the mean of its divisors is an integer number (3177398736).

Almost surely, 2^21164454265 is an apocalyptic number.

It is an amenable number.

21164454265 is a deficient number, since it is larger than the sum of its proper divisors (4254735623).

21164454265 is a wasteful number, since it uses less digits than its factorization.

21164454265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640799.

The product of its digits is 230400, while the sum is 40.

The spelling of 21164454265 in words is "twenty-one billion, one hundred sixty-four million, four hundred fifty-four thousand, two hundred sixty-five".