21164994453 has 8 divisors (see below), whose sum is σ = 28280944768. Its totient is φ = 14079520224.

The previous prime is 21164994391. The next prime is 21164994469. The reversal of 21164994453 is 35449946112.

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

It is not a de Polignac number, because 21164994453 - 2¹⁴ = 21164978069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164993453) 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, 7617400 + ... + 7620177.

It is an arithmetic number, because the mean of its divisors is an integer number (3535118096).

Almost surely, 2^21164994453 is an apocalyptic number.

It is an amenable number.

21164994453 is a deficient number, since it is larger than the sum of its proper divisors (7115950315).

21164994453 is a wasteful number, since it uses less digits than its factorization.

21164994453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15238043.

The product of its digits is 933120, while the sum is 48.

The spelling of 21164994453 in words is "twenty-one billion, one hundred sixty-four million, nine hundred ninety-four thousand, four hundred fifty-three".