21445074 has 40 divisors (see below), whose sum is σ = 54920448. Its totient is φ = 6126840.

The previous prime is 21445037. The next prime is 21445111. The reversal of 21445074 is 47054412.

It is an interprime number because it is at equal distance from previous prime (21445037) and next prime (21445111).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 8322 + ... + 10589.

Almost surely, 2^21445074 is an apocalyptic number.

21445074 is an abundant number, since it is smaller than the sum of its proper divisors (33475374).

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

21445074 is a wasteful number, since it uses less digits than its factorization.

21445074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932 (or 18923 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 21445074 is about 4630.8826372518. The cubic root of 21445074 is about 277.8278958221.

Adding to 21445074 its reverse (47054412), we get a palindrome (68499486).

The spelling of 21445074 in words is "twenty-one million, four hundred forty-five thousand, seventy-four".