21518840013140 has 48 divisors (see below), whose sum is σ = 48134287418112. Its totient is φ = 8052700094976.

The previous prime is 21518840013137. The next prime is 21518840013173. The reversal of 21518840013140 is 4131004881512.

It is a super-2 number, since 2×21518840013140² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21518840013094 and 21518840013103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189436352 + ... + 189549911.

It is an arithmetic number, because the mean of its divisors is an integer number (1002797654544).

Almost surely, 2^{21518840013140} is an apocalyptic number.

21518840013140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21518840013140 is an abundant number, since it is smaller than the sum of its proper divisors (26615447404972).

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

21518840013140 is a wasteful number, since it uses less digits than its factorization.

21518840013140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378986456 (or 378986454 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

Adding to 21518840013140 its reverse (4131004881512), we get a palindrome (25649844894652).

The spelling of 21518840013140 in words is "twenty-one trillion, five hundred eighteen billion, eight hundred forty million, thirteen thousand, one hundred forty".