21412371708 has 672 divisors, whose sum is σ = 75682467840. Its totient is φ = 5139624960.

The previous prime is 21412371671. The next prime is 21412371751. The reversal of 21412371708 is 80717321412.

21412371708 is a `hidden beast` number, since 214 + 1 + 2 + 371 + 70 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 156294616 + ... + 156294752.

It is an arithmetic number, because the mean of its divisors is an integer number (112622720).

Almost surely, 2^21412371708 is an apocalyptic number.

21412371708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21412371708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37841233920).

21412371708 is an abundant number, since it is smaller than the sum of its proper divisors (54270096132).

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

21412371708 is a wasteful number, since it uses less digits than its factorization.

21412371708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 21412371708 in words is "twenty-one billion, four hundred twelve million, three hundred seventy-one thousand, seven hundred eight".