23949399075821 has 2 divisors, whose sum is σ = 23949399075822. Its totient is φ = 23949399075820.

The previous prime is 23949399075803. The next prime is 23949399075883. The reversal of 23949399075821 is 12857099394932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22945968138025 + 1003430937796 = 4790195^2 + 1001714^2 .

It is a cyclic number.

It is not a de Polignac number, because 23949399075821 - 2¹⁴ = 23949399059437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23949399095821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11974699537910 + 11974699537911.

It is an arithmetic number, because the mean of its divisors is an integer number (11974699537911).

Almost surely, 2^{23949399075821} is an apocalyptic number.

It is an amenable number.

23949399075821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23949399075821 is an equidigital number, since it uses as much as digits as its factorization.

23949399075821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264539520, while the sum is 71.

The spelling of 23949399075821 in words is "twenty-three trillion, nine hundred forty-nine billion, three hundred ninety-nine million, seventy-five thousand, eight hundred twenty-one".