21423400312140 has 96 divisors (see below), whose sum is σ = 66999534981120. Its totient is φ = 5682996216000.

The previous prime is 21423400312133. The next prime is 21423400312157. The reversal of 21423400312140 is 4121300432412.

21423400312140 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 340 + 0 + 312 + 1 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103752786 + ... + 103959065.

It is an arithmetic number, because the mean of its divisors is an integer number (697911822720).

Almost surely, 2^{21423400312140} is an apocalyptic number.

21423400312140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423400312140 is an abundant number, since it is smaller than the sum of its proper divisors (45576134668980).

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

21423400312140 is a wasteful number, since it uses less digits than its factorization.

21423400312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207712060 (or 207712052 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21423400312140 its reverse (4121300432412), we get a palindrome (25544700744552).

The spelling of 21423400312140 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred million, three hundred twelve thousand, one hundred forty".