21449382290 has 96 divisors (see below), whose sum is σ = 47205763200. Its totient is φ = 6850248192.

The previous prime is 21449382289. The next prime is 21449382293. The reversal of 21449382290 is 9228394412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21449382293) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12623861 + ... + 12625559.

It is an arithmetic number, because the mean of its divisors is an integer number (491726700).

Almost surely, 2^21449382290 is an apocalyptic number.

21449382290 is an abundant number, since it is smaller than the sum of its proper divisors (25756380910).

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

21449382290 is a wasteful number, since it uses less digits than its factorization.

21449382290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 21449382290 in words is "twenty-one billion, four hundred forty-nine million, three hundred eighty-two thousand, two hundred ninety".