21400012031424 has 112 divisors (see below), whose sum is σ = 62624325152928. Its totient is φ = 6406656380928.

The previous prime is 21400012031417. The next prime is 21400012031477. The reversal of 21400012031424 is 42413021000412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21400012031394 and 21400012031403.

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, 115768767 + ... + 115953470.

It is an arithmetic number, because the mean of its divisors is an integer number (559145760294).

Almost surely, 2^{21400012031424} is an apocalyptic number.

21400012031424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21400012031424 is an abundant number, since it is smaller than the sum of its proper divisors (41224313121504).

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

21400012031424 is a wasteful number, since it uses less digits than its factorization.

21400012031424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231722302 (or 231722292 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21400012031424 its reverse (42413021000412), we get a palindrome (63813033031836).

The spelling of 21400012031424 in words is "twenty-one trillion, four hundred billion, twelve million, thirty-one thousand, four hundred twenty-four".