21715001123 has 8 divisors (see below), whose sum is σ = 21810563376. Its totient is φ = 21619620000.

The previous prime is 21715001107. The next prime is 21715001141. The reversal of 21715001123 is 32110051712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21715001123 - 2⁴ = 21715001107 is a prime.

It is a super-2 number, since 2×21715001123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21715001183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197873 + ... + 287373.

It is an arithmetic number, because the mean of its divisors is an integer number (2726320422).

Almost surely, 2^21715001123 is an apocalyptic number.

21715001123 is a deficient number, since it is larger than the sum of its proper divisors (95562253).

21715001123 is an equidigital number, since it uses as much as digits as its factorization.

21715001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90565.

The product of its (nonzero) digits is 420, while the sum is 23.

Adding to 21715001123 its reverse (32110051712), we get a palindrome (53825052835).

The spelling of 21715001123 in words is "twenty-one billion, seven hundred fifteen million, one thousand, one hundred twenty-three".