21980296 has 16 divisors (see below), whose sum is σ = 44383500. Its totient is φ = 10144704.

The previous prime is 21980293. The next prime is 21980317. The reversal of 21980296 is 69208912.

It can be written as a sum of positive squares in 2 ways, for example, as 21808900 + 171396 = 4670^2 + 414^2 .

It is not an unprimeable number, because it can be changed into a prime (21980293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105571 + ... + 105778.

Almost surely, 2^21980296 is an apocalyptic number.

21980296 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21980296 is an abundant number, since it is smaller than the sum of its proper divisors (22403204).

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

21980296 is a wasteful number, since it uses less digits than its factorization.

21980296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211368 (or 211364 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21980296 is about 4688.3148358445. The cubic root of 21980296 is about 280.1202544681.

The spelling of 21980296 in words is "twenty-one million, nine hundred eighty thousand, two hundred ninety-six".