21400124141220 has 96 divisors (see below), whose sum is σ = 65381328230400. Its totient is φ = 5186823461760.

The previous prime is 21400124141191. The next prime is 21400124141267. The reversal of 21400124141220 is 2214142100412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232770 + ... + 6546329.

It is an arithmetic number, because the mean of its divisors is an integer number (681055502400).

Almost surely, 2^{21400124141220} is an apocalyptic number.

21400124141220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21400124141220 is an abundant number, since it is smaller than the sum of its proper divisors (43981204089180).

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

21400124141220 is a wasteful number, since it uses less digits than its factorization.

21400124141220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783905 (or 6783903 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 21400124141220 its reverse (2214142100412), we get a palindrome (23614266241632).

The spelling of 21400124141220 in words is "twenty-one trillion, four hundred billion, one hundred twenty-four million, one hundred forty-one thousand, two hundred twenty".