13821540620 has 12 divisors (see below), whose sum is σ = 29025235344. Its totient is φ = 5528616240.

The previous prime is 13821540599. The next prime is 13821540641. The reversal of 13821540620 is 2604512831.

It is an interprime number because it is at equal distance from previous prime (13821540599) and next prime (13821540641).

It is a super-2 number, since 2×13821540620² (a number of 21 digits) contains 22 as substring.

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, 345538496 + ... + 345538535.

It is an arithmetic number, because the mean of its divisors is an integer number (2418769612).

Almost surely, 2^13821540620 is an apocalyptic number.

13821540620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13821540620 is an abundant number, since it is smaller than the sum of its proper divisors (15203694724).

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

13821540620 is a wasteful number, since it uses less digits than its factorization.

13821540620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691077040 (or 691077038 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 13821540620 in words is "thirteen billion, eight hundred twenty-one million, five hundred forty thousand, six hundred twenty".