213100917121 has 4 divisors (see below), whose sum is σ = 213104588544. Its totient is φ = 213097245700.

The previous prime is 213100917119. The next prime is 213100917167. The reversal of 213100917121 is 121719001312.

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 213100917121 - 2¹ = 213100917119 is a prime.

It is a super-2 number, since 2×213100917121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213100917121.

It is not an unprimeable number, because it can be changed into a prime (213100917221) 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, 1747225 + ... + 1865206.

It is an arithmetic number, because the mean of its divisors is an integer number (53276147136).

Almost surely, 2^213100917121 is an apocalyptic number.

It is an amenable number.

213100917121 is a deficient number, since it is larger than the sum of its proper divisors (3671423).

213100917121 is an equidigital number, since it uses as much as digits as its factorization.

213100917121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671422.

The product of its (nonzero) digits is 756, while the sum is 28.

Adding to 213100917121 its reverse (121719001312), we get a palindrome (334819918433).

The spelling of 213100917121 in words is "two hundred thirteen billion, one hundred million, nine hundred seventeen thousand, one hundred twenty-one".