21912232459 has 16 divisors (see below), whose sum is σ = 23726223360. Its totient is φ = 20116807200.

The previous prime is 21912232453. The next prime is 21912232561. The reversal of 21912232459 is 95423221912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21912232459 - 2⁵ = 21912232427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21912232453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751934 + ... + 2759884.

It is an arithmetic number, because the mean of its divisors is an integer number (1482888960).

Almost surely, 2^21912232459 is an apocalyptic number.

21912232459 is a deficient number, since it is larger than the sum of its proper divisors (1813990901).

21912232459 is a wasteful number, since it uses less digits than its factorization.

21912232459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090.

The product of its digits is 77760, while the sum is 40.

The spelling of 21912232459 in words is "twenty-one billion, nine hundred twelve million, two hundred thirty-two thousand, four hundred fifty-nine".