213121321221232 has 20 divisors (see below), whose sum is σ = 414012065312920. Its totient is φ = 106279497914688.

The previous prime is 213121321221181. The next prime is 213121321221251. The reversal of 213121321221232 is 232122123121312.

It is a self number, because there is not a number n which added to its sum of digits gives 213121321221232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17572662243 + ... + 17572674370.

It is an arithmetic number, because the mean of its divisors is an integer number (20700603265646).

Almost surely, 2^{213121321221232} is an apocalyptic number.

It is an amenable number.

213121321221232 is a deficient number, since it is larger than the sum of its proper divisors (200890744091688).

213121321221232 is a wasteful number, since it uses less digits than its factorization.

213121321221232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35145337000 (or 35145336994 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

Adding to 213121321221232 its reverse (232122123121312), we get a palindrome (445243444342544).

The spelling of 213121321221232 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-two".