21546504103 has 4 divisors (see below), whose sum is σ = 21562198488. Its totient is φ = 21530809720.

The previous prime is 21546504059. The next prime is 21546504137. The reversal of 21546504103 is 30140564512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21546504103 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 (21546504193) 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, 7845133 + ... + 7847878.

It is an arithmetic number, because the mean of its divisors is an integer number (5390549622).

Almost surely, 2^21546504103 is an apocalyptic number.

21546504103 is a deficient number, since it is larger than the sum of its proper divisors (15694385).

21546504103 is a wasteful number, since it uses less digits than its factorization.

21546504103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694384.

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

The spelling of 21546504103 in words is "twenty-one billion, five hundred forty-six million, five hundred four thousand, one hundred three".