21903315451 has 6 divisors (see below), whose sum is σ = 22062650820. Its totient is φ = 21744005328.

The previous prime is 21903315407. The next prime is 21903315509. The reversal of 21903315451 is 15451330912.

It is not a de Polignac number, because 21903315451 - 2¹¹ = 21903313403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21906315451) 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 5 ways as a sum of consecutive naturals, for example, 1738591 + ... + 1751143.

It is an arithmetic number, because the mean of its divisors is an integer number (3677108470).

Almost surely, 2^21903315451 is an apocalyptic number.

21903315451 is a deficient number, since it is larger than the sum of its proper divisors (159335369).

21903315451 is an frugal number, since it uses more digits than its factorization.

21903315451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25245 (or 12692 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 21903315451 in words is "twenty-one billion, nine hundred three million, three hundred fifteen thousand, four hundred fifty-one".