21445922541 has 8 divisors (see below), whose sum is σ = 28597000320. Its totient is φ = 14296063232.

The previous prime is 21445922503. The next prime is 21445922549. The reversal of 21445922541 is 14522954412.

It is a happy number.

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 21445922541 - 2⁷ = 21445922413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21445922541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445922549) 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, 262725 + ... + 334538.

It is an arithmetic number, because the mean of its divisors is an integer number (3574625040).

Almost surely, 2^21445922541 is an apocalyptic number.

It is an amenable number.

21445922541 is a deficient number, since it is larger than the sum of its proper divisors (7151077779).

21445922541 is a wasteful number, since it uses less digits than its factorization.

21445922541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609235.

The product of its digits is 115200, while the sum is 39.

The spelling of 21445922541 in words is "twenty-one billion, four hundred forty-five million, nine hundred twenty-two thousand, five hundred forty-one".