213122001121 has 4 divisors (see below), whose sum is σ = 215113795632. Its totient is φ = 211130206612.

The previous prime is 213122001119. The next prime is 213122001133. The reversal of 213122001121 is 121100221312.

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 not a de Polignac number, because 213122001121 - 2¹ = 213122001119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213122001095 and 213122001104.

It is not an unprimeable number, because it can be changed into a prime (213122001181) 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, 995897095 + ... + 995897308.

It is an arithmetic number, because the mean of its divisors is an integer number (53778448908).

Almost surely, 2^213122001121 is an apocalyptic number.

It is an amenable number.

213122001121 is a deficient number, since it is larger than the sum of its proper divisors (1991794511).

213122001121 is a wasteful number, since it uses less digits than its factorization.

213122001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991794510.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 213122001121 its reverse (121100221312), we get a palindrome (334222222433).

The spelling of 213122001121 in words is "two hundred thirteen billion, one hundred twenty-two million, one thousand, one hundred twenty-one".