21412074 has 8 divisors (see below), whose sum is σ = 42824160. Its totient is φ = 7137356.

The previous prime is 21412049. The next prime is 21412093. The reversal of 21412074 is 47021412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21412074 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21412074.

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 3 ways as a sum of consecutive naturals, for example, 1784334 + ... + 1784345.

It is an arithmetic number, because the mean of its divisors is an integer number (5353020).

Almost surely, 2^21412074 is an apocalyptic number.

21412074 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21412074 is a wasteful number, since it uses less digits than its factorization.

21412074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3568684.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21412074 is about 4627.3182298174. The cubic root of 21412074 is about 277.6853140903.

Adding to 21412074 its reverse (47021412), we get a palindrome (68433486).

The spelling of 21412074 in words is "twenty-one million, four hundred twelve thousand, seventy-four".