21913932241 has 4 divisors (see below), whose sum is σ = 21915919872. Its totient is φ = 21911944612.

The previous prime is 21913932221. The next prime is 21913932281. The reversal of 21913932241 is 14223931912.

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 21913932241 - 2⁷ = 21913932113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21913932241.

It is not an unprimeable number, because it can be changed into a prime (21913932221) 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, 977185 + ... + 999358.

It is an arithmetic number, because the mean of its divisors is an integer number (5478979968).

Almost surely, 2^21913932241 is an apocalyptic number.

It is an amenable number.

21913932241 is a deficient number, since it is larger than the sum of its proper divisors (1987631).

21913932241 is a wasteful number, since it uses less digits than its factorization.

21913932241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987630.

The product of its digits is 23328, while the sum is 37.

The spelling of 21913932241 in words is "twenty-one billion, nine hundred thirteen million, nine hundred thirty-two thousand, two hundred forty-one".