21451842503 has 32 divisors (see below), whose sum is σ = 27394872960. Its totient is φ = 16338309120.

The previous prime is 21451842493. The next prime is 21451842523. The reversal of 21451842503 is 30524815412.

It is not a de Polignac number, because 21451842503 - 2¹² = 21451838407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451842523) 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 31 ways as a sum of consecutive naturals, for example, 877283 + ... + 901403.

It is an arithmetic number, because the mean of its divisors is an integer number (856089780).

Almost surely, 2^21451842503 is an apocalyptic number.

21451842503 is a deficient number, since it is larger than the sum of its proper divisors (5943030457).

21451842503 is a wasteful number, since it uses less digits than its factorization.

21451842503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24507.

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 21451842503 in words is "twenty-one billion, four hundred fifty-one million, eight hundred forty-two thousand, five hundred three".