21950080 has 32 divisors (see below), whose sum is σ = 52475940. Its totient is φ = 8779776.

The previous prime is 21950053. The next prime is 21950099. The reversal of 21950080 is 8005912.

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 937024 = 4584^2 + 968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16509 + ... + 17788.

Almost surely, 2^21950080 is an apocalyptic number.

21950080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21950080 is an abundant number, since it is smaller than the sum of its proper divisors (30525860).

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

21950080 is an equidigital number, since it uses as much as digits as its factorization.

21950080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34316 (or 34304 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 21950080 is about 4685.0912477774. The cubic root of 21950080 is about 279.9918364967.

Adding to 21950080 its reverse (8005912), we get a palindrome (29955992).

The spelling of 21950080 in words is "twenty-one million, nine hundred fifty thousand, eighty".