21940715417 has 4 divisors (see below), whose sum is σ = 21974838480. Its totient is φ = 21906592356.

The previous prime is 21940715369. The next prime is 21940715437. The reversal of 21940715417 is 71451704912.

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 21940715417 - 2⁸ = 21940715161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21940715437) 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, 17060567 + ... + 17061852.

It is an arithmetic number, because the mean of its divisors is an integer number (5493709620).

Almost surely, 2^21940715417 is an apocalyptic number.

It is an amenable number.

21940715417 is a deficient number, since it is larger than the sum of its proper divisors (34123063).

21940715417 is an equidigital number, since it uses as much as digits as its factorization.

21940715417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34123062.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 21940715417 in words is "twenty-one billion, nine hundred forty million, seven hundred fifteen thousand, four hundred seventeen".