21232747501 has 4 divisors (see below), whose sum is σ = 24265997152. Its totient is φ = 18199497852.

The previous prime is 21232747483. The next prime is 21232747553. The reversal of 21232747501 is 10574723212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21232747501 - 2⁵ = 21232747469 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 (21232747301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516624815 + ... + 1516624828.

It is an arithmetic number, because the mean of its divisors is an integer number (6066499288).

Almost surely, 2^21232747501 is an apocalyptic number.

It is an amenable number.

21232747501 is a deficient number, since it is larger than the sum of its proper divisors (3033249651).

21232747501 is an equidigital number, since it uses as much as digits as its factorization.

21232747501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033249650.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 21232747501 in words is "twenty-one billion, two hundred thirty-two million, seven hundred forty-seven thousand, five hundred one".