21034302251 has 4 divisors (see below), whose sum is σ = 21118104504. Its totient is φ = 20950500000.

The previous prime is 21034302227. The next prime is 21034302253. The reversal of 21034302251 is 15220343012.

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 21034302251 - 2¹⁰ = 21034301227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034302253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41900750 + ... + 41901251.

It is an arithmetic number, because the mean of its divisors is an integer number (5279526126).

Almost surely, 2^21034302251 is an apocalyptic number.

21034302251 is a deficient number, since it is larger than the sum of its proper divisors (83802253).

21034302251 is an equidigital number, since it uses as much as digits as its factorization.

21034302251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83802252.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21034302251 its reverse (15220343012), we get a palindrome (36254645263).

The spelling of 21034302251 in words is "twenty-one billion, thirty-four million, three hundred two thousand, two hundred fifty-one".