2121012308916 has 18 divisors (see below), whose sum is σ = 5361447780962. Its totient is φ = 707004102960.

The previous prime is 2121012308897. The next prime is 2121012308917. The reversal of 2121012308916 is 6198032101212.

It can be written as a sum of positive squares in only one way, i.e., 2091627492516 + 29384816400 = 1446246^2 + 171420^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 58917008581 = 2121012308916 / (2 + 1 + 2 + 1 + 0 + 1 + 2 + 3 + 0 + 8 + 9 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012308917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29458504255 + ... + 29458504326.

Almost surely, 2^{2121012308916} is an apocalyptic number.

It is an amenable number.

2121012308916 is an abundant number, since it is smaller than the sum of its proper divisors (3240435472046).

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

2121012308916 is a wasteful number, since it uses less digits than its factorization.

2121012308916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58917008591 (or 58917008586 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 2121012308916 in words is "two trillion, one hundred twenty-one billion, twelve million, three hundred eight thousand, nine hundred sixteen".