21406202004140 has 48 divisors (see below), whose sum is σ = 45068802408000. Its totient is φ = 8540441075712.

The previous prime is 21406202004127. The next prime is 21406202004197. The reversal of 21406202004140 is 4140020260412.

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, 25512416 + ... + 26338104.

It is an arithmetic number, because the mean of its divisors is an integer number (938933383500).

Almost surely, 2^{21406202004140} is an apocalyptic number.

21406202004140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21406202004140 is an abundant number, since it is smaller than the sum of its proper divisors (23662600403860).

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

21406202004140 is a wasteful number, since it uses less digits than its factorization.

21406202004140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829034 (or 829032 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21406202004140 its reverse (4140020260412), we get a palindrome (25546222264552).

The spelling of 21406202004140 in words is "twenty-one trillion, four hundred six billion, two hundred two million, four thousand, one hundred forty".