23211387901 has 4 divisors (see below), whose sum is σ = 24996879292. Its totient is φ = 21425896512.

The previous prime is 23211387889. The next prime is 23211387907. The reversal of 23211387901 is 10978311232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3883159225 + 19328228676 = 62315^2 + 139026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23211387901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211387907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892745676 + ... + 892745701.

It is an arithmetic number, because the mean of its divisors is an integer number (6249219823).

Almost surely, 2^23211387901 is an apocalyptic number.

It is an amenable number.

23211387901 is a deficient number, since it is larger than the sum of its proper divisors (1785491391).

23211387901 is a wasteful number, since it uses less digits than its factorization.

23211387901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785491390.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 23211387901 in words is "twenty-three billion, two hundred eleven million, three hundred eighty-seven thousand, nine hundred one".