21603223611751 has 4 divisors (see below), whose sum is σ = 21605189875912. Its totient is φ = 21601257347592.

The previous prime is 21603223611691. The next prime is 21603223611797. The reversal of 21603223611751 is 15711632230612.

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 21603223611751 - 2²⁷ = 21603089394023 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 (21603223611251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983115600 + ... + 983137573.

It is an arithmetic number, because the mean of its divisors is an integer number (5401297468978).

Almost surely, 2^{21603223611751} is an apocalyptic number.

21603223611751 is a deficient number, since it is larger than the sum of its proper divisors (1966264161).

21603223611751 is a wasteful number, since it uses less digits than its factorization.

21603223611751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966264160.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21603223611751 in words is "twenty-one trillion, six hundred three billion, two hundred twenty-three million, six hundred eleven thousand, seven hundred fifty-one".