213111141001421 has 16 divisors (see below), whose sum is σ = 231197089233264. Its totient is φ = 195267237249024.

The previous prime is 213111141001417. The next prime is 213111141001471. The reversal of 213111141001421 is 124100141111312.

It can be written as a sum of positive squares in 8 ways, for example, as 10168636768900 + 202942504232521 = 3188830^2 + 14245789^2 .

It is a cyclic number.

It is not a de Polignac number, because 213111141001421 - 2² = 213111141001417 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 (213111141001471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18927821 + ... + 28008653.

It is an arithmetic number, because the mean of its divisors is an integer number (14449818077079).

Almost surely, 2^{213111141001421} is an apocalyptic number.

It is an amenable number.

213111141001421 is a deficient number, since it is larger than the sum of its proper divisors (18085948231843).

213111141001421 is a wasteful number, since it uses less digits than its factorization.

213111141001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094160.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 213111141001421 its reverse (124100141111312), we get a palindrome (337211282112733).

The spelling of 213111141001421 in words is "two hundred thirteen trillion, one hundred eleven billion, one hundred forty-one million, one thousand, four hundred twenty-one".