21014244 has 36 divisors (see below), whose sum is σ = 56245644. Its totient is φ = 6592512.

The previous prime is 21014243. The next prime is 21014297. The reversal of 21014244 is 44241012.

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 8054244 = 3600^2 + 2838^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (21014243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16557 + ... + 17780.

It is an arithmetic number, because the mean of its divisors is an integer number (1562379).

Almost surely, 2^21014244 is an apocalyptic number.

It is an amenable number.

21014244 is an abundant number, since it is smaller than the sum of its proper divisors (35231400).

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

21014244 is a wasteful number, since it uses less digits than its factorization.

21014244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34364 (or 34359 counting only the distinct ones).

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

The square root of 21014244 is about 4584.1295793204. The cubic root of 21014244 is about 275.9547815019.

Adding to 21014244 its reverse (44241012), we get a palindrome (65255256).

The spelling of 21014244 in words is "twenty-one million, fourteen thousand, two hundred forty-four".