21014442 has 12 divisors (see below), whose sum is σ = 45531330. Its totient is φ = 7004808.

The previous prime is 21014429. The next prime is 21014453. The reversal of 21014442 is 24441012.

21014442 is a `hidden beast` number, since 210 + 14 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19000881 + 2013561 = 4359^2 + 1419^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167469 = 21014442 / (2 + 1 + 0 + 1 + 4 + 4 + 4 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583717 + ... + 583752.

Almost surely, 2^21014442 is an apocalyptic number.

21014442 is an abundant number, since it is smaller than the sum of its proper divisors (24516888).

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

21014442 is a wasteful number, since it uses less digits than its factorization.

21014442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167477 (or 1167474 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 21014442 is about 4584.1511755177. The cubic root of 21014442 is about 275.9556481978.

Adding to 21014442 its reverse (24441012), we get a palindrome (45455454).

The spelling of 21014442 in words is "twenty-one million, fourteen thousand, four hundred forty-two".