11864701921 has 2 divisors, whose sum is σ = 11864701922. Its totient is φ = 11864701920.

The previous prime is 11864701883. The next prime is 11864701969. The reversal of 11864701921 is 12910746811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11699450896 + 165251025 = 108164^2 + 12855^2 .

It is a cyclic number.

It is not a de Polignac number, because 11864701921 - 2²¹ = 11862604769 is a prime.

It is not a weakly prime, because it can be changed into another prime (11864701621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932350960 + 5932350961.

It is an arithmetic number, because the mean of its divisors is an integer number (5932350961).

Almost surely, 2^11864701921 is an apocalyptic number.

It is an amenable number.

11864701921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11864701921 is an equidigital number, since it uses as much as digits as its factorization.

11864701921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 11864701921 in words is "eleven billion, eight hundred sixty-four million, seven hundred one thousand, nine hundred twenty-one".