2121211100012 has 24 divisors (see below), whose sum is σ = 3718603228704. Its totient is φ = 1058753469312.

The previous prime is 2121211100011. The next prime is 2121211100017. The reversal of 2121211100012 is 2100011121212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121211100012.

It is not an unprimeable number, because it can be changed into a prime (2121211100011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21291098 + ... + 21390494.

It is an arithmetic number, because the mean of its divisors is an integer number (154941801196).

Almost surely, 2^{2121211100012} is an apocalyptic number.

It is an amenable number.

2121211100012 is a deficient number, since it is larger than the sum of its proper divisors (1597392128692).

2121211100012 is a wasteful number, since it uses less digits than its factorization.

2121211100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108665 (or 108663 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121211100012 its reverse (2100011121212), we get a palindrome (4221222221224).

The spelling of 2121211100012 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred thousand, twelve".