213111303123221 has 8 divisors (see below), whose sum is σ = 217138503648600. Its totient is φ = 209084333432832.

The previous prime is 213111303123211. The next prime is 213111303123241. The reversal of 213111303123221 is 122321303111312.

It can be written as a sum of positive squares in 4 ways, for example, as 39583110663121 + 173528192460100 = 6291511^2 + 13173010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213111303123221 - 2²⁶ = 213111236014357 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 (213111303123211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55844300 + ... + 59538293.

It is an arithmetic number, because the mean of its divisors is an integer number (27142312956075).

Almost surely, 2^{213111303123221} is an apocalyptic number.

It is an amenable number.

213111303123221 is a deficient number, since it is larger than the sum of its proper divisors (4027200525379).

213111303123221 is a wasteful number, since it uses less digits than its factorization.

213111303123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115417495.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 213111303123221 its reverse (122321303111312), we get a palindrome (335432606234533).

The spelling of 213111303123221 in words is "two hundred thirteen trillion, one hundred eleven billion, three hundred three million, one hundred twenty-three thousand, two hundred twenty-one".