21349312451 has 8 divisors (see below), whose sum is σ = 21515205264. Its totient is φ = 21183845760.

The previous prime is 21349312441. The next prime is 21349312493. The reversal of 21349312451 is 15421394312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21349312451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21349312441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5570 + ... + 206711.

It is an arithmetic number, because the mean of its divisors is an integer number (2689400658).

Almost surely, 2^21349312451 is an apocalyptic number.

21349312451 is a deficient number, since it is larger than the sum of its proper divisors (165892813).

21349312451 is a wasteful number, since it uses less digits than its factorization.

21349312451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213061.

The product of its digits is 25920, while the sum is 35.

The spelling of 21349312451 in words is "twenty-one billion, three hundred forty-nine million, three hundred twelve thousand, four hundred fifty-one".