21999480 has 32 divisors (see below), whose sum is σ = 65998800. Its totient is φ = 5866496.

The previous prime is 21999469. The next prime is 21999539. The reversal of 21999480 is 8499912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91545 + ... + 91784.

Almost surely, 2^21999480 is an apocalyptic number.

21999480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21999480 is an abundant number, since it is smaller than the sum of its proper divisors (43999320).

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

21999480 is a wasteful number, since it uses less digits than its factorization.

21999480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183343 (or 183339 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 21999480 is about 4690.3603273096. The cubic root of 21999480 is about 280.2017253808.

It can be divided in two parts, 219 and 99480, that added together give a palindrome (99699).

The spelling of 21999480 in words is "twenty-one million, nine hundred ninety-nine thousand, four hundred eighty".