213121020311 has 2 divisors, whose sum is σ = 213121020312. Its totient is φ = 213121020310.

The previous prime is 213121020283. The next prime is 213121020361. The reversal of 213121020311 is 113020121312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121020311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213121020311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213121020361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560510155 + 106560510156.

It is an arithmetic number, because the mean of its divisors is an integer number (106560510156).

Almost surely, 2^213121020311 is an apocalyptic number.

213121020311 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121020311 is an equidigital number, since it uses as much as digits as its factorization.

213121020311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213121020311 its reverse (113020121312), we get a palindrome (326141141623).

The spelling of 213121020311 in words is "two hundred thirteen billion, one hundred twenty-one million, twenty thousand, three hundred eleven".