21542625103 has 4 divisors (see below), whose sum is σ = 21815316640. Its totient is φ = 21269933568.

The previous prime is 21542625077. The next prime is 21542625113. The reversal of 21542625103 is 30152624512.

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 21542625103 - 2⁹ = 21542624591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542625113) 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, 136345650 + ... + 136345807.

It is an arithmetic number, because the mean of its divisors is an integer number (5453829160).

Almost surely, 2^21542625103 is an apocalyptic number.

21542625103 is a deficient number, since it is larger than the sum of its proper divisors (272691537).

21542625103 is an equidigital number, since it uses as much as digits as its factorization.

21542625103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272691536.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21542625103 in words is "twenty-one billion, five hundred forty-two million, six hundred twenty-five thousand, one hundred three".