13721554240 has 56 divisors (see below), whose sum is σ = 33088112640. Its totient is φ = 5419135488.

The previous prime is 13721554237. The next prime is 13721554277. The reversal of 13721554240 is 4245512731.

It is a super-2 number, since 2×13721554240² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13721554196 and 13721554205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246112 + ... + 296671.

Almost surely, 2^13721554240 is an apocalyptic number.

13721554240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13721554240 is an abundant number, since it is smaller than the sum of its proper divisors (19366558400).

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

13721554240 is an equidigital number, since it uses as much as digits as its factorization.

13721554240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542879 (or 542869 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 13721554240 in words is "thirteen billion, seven hundred twenty-one million, five hundred fifty-four thousand, two hundred forty".