2121053543540 has 96 divisors (see below), whose sum is σ = 4617008242560. Its totient is φ = 817979542016.

The previous prime is 2121053543507. The next prime is 2121053543549. The reversal of 2121053543540 is 453453501212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121053543540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121053543549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209316314 + ... + 209326446.

It is an arithmetic number, because the mean of its divisors is an integer number (48093835860).

Almost surely, 2^{2121053543540} is an apocalyptic number.

2121053543540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121053543540 is an abundant number, since it is smaller than the sum of its proper divisors (2495954699020).

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

2121053543540 is a wasteful number, since it uses less digits than its factorization.

2121053543540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13601 (or 13599 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 2121053543540 in words is "two trillion, one hundred twenty-one billion, fifty-three million, five hundred forty-three thousand, five hundred forty".