21445850 has 24 divisors (see below), whose sum is σ = 40084860. Its totient is φ = 8536320.

The previous prime is 21445847. The next prime is 21445861. The reversal of 21445850 is 5854412.

It can be written as a sum of positive squares in 6 ways, for example, as 6692569 + 14753281 = 2587^2 + 3841^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10514 + ... + 12386.

Almost surely, 2^21445850 is an apocalyptic number.

21445850 is a deficient number, since it is larger than the sum of its proper divisors (18639010).

21445850 is a wasteful number, since it uses less digits than its factorization.

21445850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 21445850 is about 4630.9664218174. The cubic root of 21445850 is about 277.8312468923.

It can be divided in two parts, 214 and 45850, that added together give a palindrome (46064).

The spelling of 21445850 in words is "twenty-one million, four hundred forty-five thousand, eight hundred fifty".