21621337372703 has 4 divisors (see below), whose sum is σ = 21624977947320. Its totient is φ = 21617696798088.

The previous prime is 21621337372681. The next prime is 21621337372729. The reversal of 21621337372703 is 30727373312612.

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-21621337372703 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 (21621337371703) 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, 1820278400 + ... + 1820290277.

It is an arithmetic number, because the mean of its divisors is an integer number (5406244486830).

Almost surely, 2^{21621337372703} is an apocalyptic number.

21621337372703 is a deficient number, since it is larger than the sum of its proper divisors (3640574617).

21621337372703 is an equidigital number, since it uses as much as digits as its factorization.

21621337372703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640574616.

The product of its (nonzero) digits is 1333584, while the sum is 47.

The spelling of 21621337372703 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-seven million, three hundred seventy-two thousand, seven hundred three".