2100121121108 has 6 divisors (see below), whose sum is σ = 3675211961946. Its totient is φ = 1050060560552.

The previous prime is 2100121121107. The next prime is 2100121121179. The reversal of 2100121121108 is 8011211210012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1194251181124 + 905869939984 = 1092818^2 + 951772^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2100121121108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100121121107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262515140135 + ... + 262515140142.

It is an arithmetic number, because the mean of its divisors is an integer number (612535326991).

Almost surely, 2^{2100121121108} is an apocalyptic number.

It is an amenable number.

2100121121108 is a deficient number, since it is larger than the sum of its proper divisors (1575090840838).

2100121121108 is a wasteful number, since it uses less digits than its factorization.

2100121121108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525030280281 (or 525030280279 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 2100121121108 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eight".