21246187410 has 448 divisors, whose sum is σ = 73092844800. Its totient is φ = 4326690816.

The previous prime is 21246187387. The next prime is 21246187421. The reversal of 21246187410 is 1478164212.

It is a happy number.

21246187410 is a `hidden beast` number, since 2 + 1 + 24 + 618 + 7 + 4 + 10 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 16482046 + ... + 16483334.

Almost surely, 2^21246187410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21246187410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36546422400).

21246187410 is an abundant number, since it is smaller than the sum of its proper divisors (51846657390).

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

21246187410 is a wasteful number, since it uses less digits than its factorization.

21246187410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 21246187410 in words is "twenty-one billion, two hundred forty-six million, one hundred eighty-seven thousand, four hundred ten".