21313212111201 has 4 divisors (see below), whose sum is σ = 28417616148272. Its totient is φ = 14208808074132.

The previous prime is 21313212111193. The next prime is 21313212111203. The reversal of 21313212111201 is 10211121231312.

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 not a de Polignac number, because 21313212111201 - 2³ = 21313212111193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313212111203) 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, 3552202018531 + ... + 3552202018536.

It is an arithmetic number, because the mean of its divisors is an integer number (7104404037068).

Almost surely, 2^{21313212111201} is an apocalyptic number.

It is an amenable number.

21313212111201 is a deficient number, since it is larger than the sum of its proper divisors (7104404037071).

21313212111201 is an equidigital number, since it uses as much as digits as its factorization.

21313212111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104404037070.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21313212111201 its reverse (10211121231312), we get a palindrome (31524333342513).

The spelling of 21313212111201 in words is "twenty-one trillion, three hundred thirteen billion, two hundred twelve million, one hundred eleven thousand, two hundred one".