23643640421 has 4 divisors (see below), whose sum is σ = 23873190432. Its totient is φ = 23414090412.

The previous prime is 23643640411. The next prime is 23643640439. The reversal of 23643640421 is 12404634632.

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 23643640421 - 2⁶ = 23643640357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23643640411) 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, 114774851 + ... + 114775056.

It is an arithmetic number, because the mean of its divisors is an integer number (5968297608).

Almost surely, 2^23643640421 is an apocalyptic number.

It is an amenable number.

23643640421 is a deficient number, since it is larger than the sum of its proper divisors (229550011).

23643640421 is a wasteful number, since it uses less digits than its factorization.

23643640421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229550010.

The product of its (nonzero) digits is 82944, while the sum is 35.

The spelling of 23643640421 in words is "twenty-three billion, six hundred forty-three million, six hundred forty thousand, four hundred twenty-one".