23520421777 has 2 divisors, whose sum is σ = 23520421778. Its totient is φ = 23520421776.

The previous prime is 23520421747. The next prime is 23520421789. The reversal of 23520421777 is 77712402532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13123764481 + 10396657296 = 114559^2 + 101964^2 .

It is a cyclic number.

It is not a de Polignac number, because 23520421777 - 2¹¹ = 23520419729 is a prime.

It is not a weakly prime, because it can be changed into another prime (23520421747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11760210888 + 11760210889.

It is an arithmetic number, because the mean of its divisors is an integer number (11760210889).

Almost surely, 2^23520421777 is an apocalyptic number.

It is an amenable number.

23520421777 is a deficient number, since it is larger than the sum of its proper divisors (1).

23520421777 is an equidigital number, since it uses as much as digits as its factorization.

23520421777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 40.

The spelling of 23520421777 in words is "twenty-three billion, five hundred twenty million, four hundred twenty-one thousand, seven hundred seventy-seven".