23644826921 has 2 divisors, whose sum is σ = 23644826922. Its totient is φ = 23644826920.

The previous prime is 23644826879. The next prime is 23644826923. The reversal of 23644826921 is 12962844632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13844816896 + 9800010025 = 117664^2 + 98995^2 .

It is a cyclic number.

It is not a de Polignac number, because 23644826921 - 2¹⁴ = 23644810537 is a prime.

Together with 23644826923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23644826923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11822413460 + 11822413461.

It is an arithmetic number, because the mean of its divisors is an integer number (11822413461).

Almost surely, 2^23644826921 is an apocalyptic number.

It is an amenable number.

23644826921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23644826921 is an equidigital number, since it uses as much as digits as its factorization.

23644826921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 47.

The spelling of 23644826921 in words is "twenty-three billion, six hundred forty-four million, eight hundred twenty-six thousand, nine hundred twenty-one".