21403322451 has 96 divisors (see below), whose sum is σ = 37802419200. Its totient is φ = 11642400000.

The previous prime is 21403322431. The next prime is 21403322453. The reversal of 21403322451 is 15422330412.

It is not a de Polignac number, because 21403322451 - 2⁶ = 21403322387 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21403322453) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17820651 + ... + 17821851.

It is an arithmetic number, because the mean of its divisors is an integer number (393775200).

Almost surely, 2^21403322451 is an apocalyptic number.

21403322451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21403322451 is a deficient number, since it is larger than the sum of its proper divisors (16399096749).

21403322451 is a wasteful number, since it uses less digits than its factorization.

21403322451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21403322451 its reverse (15422330412), we get a palindrome (36825652863).

The spelling of 21403322451 in words is "twenty-one billion, four hundred three million, three hundred twenty-two thousand, four hundred fifty-one".