21313123001 has 4 divisors (see below), whose sum is σ = 21613307904. Its totient is φ = 21012938100.

The previous prime is 21313122979. The next prime is 21313123019. The reversal of 21313123001 is 10032131312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313123001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313123021) 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, 150092345 + ... + 150092486.

It is an arithmetic number, because the mean of its divisors is an integer number (5403326976).

Almost surely, 2^21313123001 is an apocalyptic number.

It is an amenable number.

21313123001 is a deficient number, since it is larger than the sum of its proper divisors (300184903).

21313123001 is an equidigital number, since it uses as much as digits as its factorization.

21313123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300184902.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21313123001 its reverse (10032131312), we get a palindrome (31345254313).

The spelling of 21313123001 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-three thousand, one".