2121123111210 has 64 divisors (see below), whose sum is σ = 5659639257600. Its totient is φ = 565301733696.

The previous prime is 2121123111203. The next prime is 2121123111251. The reversal of 2121123111210 is 121113211212.

It is a happy number.

2121123111210 is a `hidden beast` number, since 2 + 1 + 211 + 231 + 11 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1836994 + ... + 2759853.

It is an arithmetic number, because the mean of its divisors is an integer number (88431863400).

Almost surely, 2^{2121123111210} is an apocalyptic number.

2121123111210 is an abundant number, since it is smaller than the sum of its proper divisors (3538516146390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121123111210 is a wasteful number, since it uses less digits than its factorization.

2121123111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598572 (or 4598566 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 2121123111210 its reverse (121113211212), we get a palindrome (2242236322422).

The spelling of 2121123111210 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, two hundred ten".