21830797501 has 4 divisors (see below), whose sum is σ = 21896751904. Its totient is φ = 21764843100.

The previous prime is 21830797493. The next prime is 21830797529. The reversal of 21830797501 is 10579703812.

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 21830797501 - 2³ = 21830797493 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 (21830797601) 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, 32976705 + ... + 32977366.

It is an arithmetic number, because the mean of its divisors is an integer number (5474187976).

Almost surely, 2^21830797501 is an apocalyptic number.

It is an amenable number.

21830797501 is a deficient number, since it is larger than the sum of its proper divisors (65954403).

21830797501 is an equidigital number, since it uses as much as digits as its factorization.

21830797501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65954402.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 21830797501 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-seven thousand, five hundred one".