21490303296 has 448 divisors, whose sum is σ = 77122105344. Its totient is φ = 5109350400.

The previous prime is 21490303201. The next prime is 21490303301. The reversal of 21490303296 is 69230309412.

It is a tau number, because it is divible by the number of its divisors (448).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9297981 + ... + 9300291.

Almost surely, 2^21490303296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21490303296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38561052672).

21490303296 is an abundant number, since it is smaller than the sum of its proper divisors (55631802048).

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

21490303296 is a wasteful number, since it uses less digits than its factorization.

21490303296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 21490303296 in words is "twenty-one billion, four hundred ninety million, three hundred three thousand, two hundred ninety-six".