21426502003 has 4 divisors (see below), whose sum is σ = 21426831288. Its totient is φ = 21426172720.

The previous prime is 21426501961. The next prime is 21426502021. The reversal of 21426502003 is 30020562412.

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 21426502003 - 2³³ = 12836567411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21426502073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30733 + ... + 209278.

It is an arithmetic number, because the mean of its divisors is an integer number (5356707822).

Almost surely, 2^21426502003 is an apocalyptic number.

21426502003 is a deficient number, since it is larger than the sum of its proper divisors (329285).

21426502003 is an equidigital number, since it uses as much as digits as its factorization.

21426502003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329284.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21426502003 in words is "twenty-one billion, four hundred twenty-six million, five hundred two thousand, three".