2021552312540 has 12 divisors (see below), whose sum is σ = 4245259856376. Its totient is φ = 808620925008.

The previous prime is 2021552312447. The next prime is 2021552312587. The reversal of 2021552312540 is 452132551202.

It is a junction number, because it is equal to n+sod(n) for n = 2021552312497 and 2021552312506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50538807794 + ... + 50538807833.

It is an arithmetic number, because the mean of its divisors is an integer number (353771654698).

Almost surely, 2^{2021552312540} is an apocalyptic number.

2021552312540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021552312540 is an abundant number, since it is smaller than the sum of its proper divisors (2223707543836).

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

2021552312540 is a wasteful number, since it uses less digits than its factorization.

2021552312540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101077615636 (or 101077615634 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 2021552312540 its reverse (452132551202), we get a palindrome (2473684863742).

The spelling of 2021552312540 in words is "two trillion, twenty-one billion, five hundred fifty-two million, three hundred twelve thousand, five hundred forty".