21915050 has 12 divisors (see below), whose sum is σ = 40762086. Its totient is φ = 8766000.

The previous prime is 21915041. The next prime is 21915059. The reversal of 21915050 is 5051912.

It is an interprime number because it is at equal distance from previous prime (21915041) and next prime (21915059).

It can be written as a sum of positive squares in 3 ways, for example, as 12061729 + 9853321 = 3473^2 + 3139^2 .

It is not an unprimeable number, because it can be changed into a prime (21915059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219101 + ... + 219200.

Almost surely, 2^21915050 is an apocalyptic number.

21915050 is a deficient number, since it is larger than the sum of its proper divisors (18847036).

21915050 is a wasteful number, since it uses less digits than its factorization.

21915050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438313 (or 438308 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 21915050 is about 4681.3513006396. The cubic root of 21915050 is about 279.8428114326.

Adding to 21915050 its reverse (5051912), we get a palindrome (26966962).

The spelling of 21915050 in words is "twenty-one million, nine hundred fifteen thousand, fifty".