21324702451 has 8 divisors (see below), whose sum is σ = 23009150304. Its totient is φ = 19646552640.

The previous prime is 21324702419. The next prime is 21324702457. The reversal of 21324702451 is 15420742312.

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 21324702451 - 2⁵ = 21324702419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324702457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567471 + ... + 1581016.

It is an arithmetic number, because the mean of its divisors is an integer number (2876143788).

Almost surely, 2^21324702451 is an apocalyptic number.

21324702451 is a deficient number, since it is larger than the sum of its proper divisors (1684447853).

21324702451 is a wasteful number, since it uses less digits than its factorization.

21324702451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149021.

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 21324702451 in words is "twenty-one billion, three hundred twenty-four million, seven hundred two thousand, four hundred fifty-one".