21403887174 has 72 divisors (see below), whose sum is σ = 48801464280. Its totient is φ = 6953656248.

The previous prime is 21403887149. The next prime is 21403887221. The reversal of 21403887174 is 47178830412.

It is a Curzon number.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 46228467 + ... + 46228929.

It is an arithmetic number, because the mean of its divisors is an integer number (677798115).

Almost surely, 2^21403887174 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21403887174, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24400732140).

21403887174 is an abundant number, since it is smaller than the sum of its proper divisors (27397577106).

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

21403887174 is an frugal number, since it uses more digits than its factorization.

21403887174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 21403887174 in words is "twenty-one billion, four hundred three million, eight hundred eighty-seven thousand, one hundred seventy-four".