23619721 has 2 divisors, whose sum is σ = 23619722. Its totient is φ = 23619720.

The previous prime is 23619707. The next prime is 23619733. The reversal of 23619721 is 12791632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23619600 + 121 = 4860^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 23619721 - 2¹¹ = 23617673 is a prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (23619121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11809860 + 11809861.

It is an arithmetic number, because the mean of its divisors is an integer number (11809861).

Almost surely, 2^23619721 is an apocalyptic number.

It is an amenable number.

23619721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23619721 is an equidigital number, since it uses as much as digits as its factorization.

23619721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 23619721 is about 4860.0124485437. The cubic root of 23619721 is about 286.9183036255.

The spelling of 23619721 in words is "twenty-three million, six hundred nineteen thousand, seven hundred twenty-one".