21995450 has 48 divisors (see below), whose sum is σ = 43892280. Its totient is φ = 8171520.

The previous prime is 21995447. The next prime is 21995453. The reversal of 21995450 is 5459912.

It is an interprime number because it is at equal distance from previous prime (21995447) and next prime (21995453).

It can be written as a sum of positive squares in 12 ways, for example, as 2343961 + 19651489 = 1531^2 + 4433^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21995450.

It is not an unprimeable number, because it can be changed into a prime (21995453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95936 + ... + 96164.

Almost surely, 2^21995450 is an apocalyptic number.

21995450 is a deficient number, since it is larger than the sum of its proper divisors (21896830).

21995450 is a wasteful number, since it uses less digits than its factorization.

21995450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 21995450 is about 4689.9307031128. The cubic root of 21995450 is about 280.1846146444.

The spelling of 21995450 in words is "twenty-one million, nine hundred ninety-five thousand, four hundred fifty".