213121213322989 has 4 divisors (see below), whose sum is σ = 213142989281824. Its totient is φ = 213099437364156.

The previous prime is 213121213322987. The next prime is 213121213323013. The reversal of 213121213322989 is 989223312121312.

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 213121213322989 - 2¹ = 213121213322987 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 (213121213322987) 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, 10887964737 + ... + 10887984310.

It is an arithmetic number, because the mean of its divisors is an integer number (53285747320456).

Almost surely, 2^{213121213322989} is an apocalyptic number.

It is an amenable number.

213121213322989 is a deficient number, since it is larger than the sum of its proper divisors (21775958835).

213121213322989 is an equidigital number, since it uses as much as digits as its factorization.

213121213322989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21775958834.

The product of its digits is 559872, while the sum is 49.

The spelling of 213121213322989 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred thirteen million, three hundred twenty-two thousand, nine hundred eighty-nine".