21925919541 has 8 divisors (see below), whose sum is σ = 30954239424. Its totient is φ = 13757439680.

The previous prime is 21925919531. The next prime is 21925919563. The reversal of 21925919541 is 14591952912.

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 21925919541 - 2¹⁰ = 21925918517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925919501) 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, 214959945 + ... + 214960046.

It is an arithmetic number, because the mean of its divisors is an integer number (3869279928).

Almost surely, 2^21925919541 is an apocalyptic number.

It is an amenable number.

21925919541 is a deficient number, since it is larger than the sum of its proper divisors (9028319883).

21925919541 is a wasteful number, since it uses less digits than its factorization.

21925919541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429920011.

The product of its digits is 291600, while the sum is 48.

The spelling of 21925919541 in words is "twenty-one billion, nine hundred twenty-five million, nine hundred nineteen thousand, five hundred forty-one".