21651125003 has 4 divisors (see below), whose sum is σ = 22592478288. Its totient is φ = 20709771720.

The previous prime is 21651124987. The next prime is 21651125011. The reversal of 21651125003 is 30052115612.

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 21651125003 - 2⁴ = 21651124987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21651125063) 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, 470676608 + ... + 470676653.

It is an arithmetic number, because the mean of its divisors is an integer number (5648119572).

Almost surely, 2^21651125003 is an apocalyptic number.

21651125003 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21651125003 is a deficient number, since it is larger than the sum of its proper divisors (941353285).

21651125003 is an equidigital number, since it uses as much as digits as its factorization.

21651125003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941353284.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 21651125003 in words is "twenty-one billion, six hundred fifty-one million, one hundred twenty-five thousand, three".