21220074 has 24 divisors (see below), whose sum is σ = 48397440. Its totient is φ = 6700968.

The previous prime is 21220019. The next prime is 21220103. The reversal of 21220074 is 47002212.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 30682 + ... + 31365.

It is an arithmetic number, because the mean of its divisors is an integer number (2016560).

Almost surely, 2^21220074 is an apocalyptic number.

21220074 is an abundant number, since it is smaller than the sum of its proper divisors (27177366).

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

21220074 is a wasteful number, since it uses less digits than its factorization.

21220074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62074 (or 62071 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 21220074 is about 4606.5251546041. The cubic root of 21220074 is about 276.8528283706.

Adding to 21220074 its reverse (47002212), we get a palindrome (68222286).

The spelling of 21220074 in words is "twenty-one million, two hundred twenty thousand, seventy-four".