2121340621356 has 36 divisors (see below), whose sum is σ = 5849757472104. Its totient is φ = 642830491200.

The previous prime is 2121340621349. The next prime is 2121340621357. The reversal of 2121340621356 is 6531260431212.

2121340621356 is a `hidden beast` number, since 2 + 1 + 21 + 3 + 4 + 0 + 621 + 3 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×2121340621356³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2121340621356.

It is not an unprimeable number, because it can be changed into a prime (2121340621357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2678459985 + ... + 2678460776.

It is an arithmetic number, because the mean of its divisors is an integer number (162493263114).

Almost surely, 2^{2121340621356} is an apocalyptic number.

It is an amenable number.

2121340621356 is an abundant number, since it is smaller than the sum of its proper divisors (3728416850748).

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

2121340621356 is a wasteful number, since it uses less digits than its factorization.

2121340621356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356920782 (or 5356920777 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 2121340621356 in words is "two trillion, one hundred twenty-one billion, three hundred forty million, six hundred twenty-one thousand, three hundred fifty-six".