21014444 has 48 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 8984640.

The previous prime is 21014429. The next prime is 21014453. The reversal of 21014444 is 44441012.

21014444 = T₁₁₁₂ + T₁₁₁₃ + ... + T₁₁₄₄.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 54677 + ... + 55059.

It is an arithmetic number, because the mean of its divisors is an integer number (887040).

Almost surely, 2^21014444 is an apocalyptic number.

It is an amenable number.

21014444 is an abundant number, since it is smaller than the sum of its proper divisors (21563476).

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

21014444 is a wasteful number, since it uses less digits than its factorization.

21014444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 21014444 is about 4584.1513936606. The cubic root of 21014444 is about 275.9556569523.

Adding to 21014444 its reverse (44441012), we get a palindrome (65455456).

The spelling of 21014444 in words is "twenty-one million, fourteen thousand, four hundred forty-four".