21200572 has 24 divisors (see below), whose sum is σ = 39545856. Its totient is φ = 9921648.

The previous prime is 21200563. The next prime is 21200573. The reversal of 21200572 is 27500212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1873 + ... + 6775.

It is an arithmetic number, because the mean of its divisors is an integer number (1647744).

Almost surely, 2^21200572 is an apocalyptic number.

It is an amenable number.

21200572 is a deficient number, since it is larger than the sum of its proper divisors (18345284).

21200572 is a wasteful number, since it uses less digits than its factorization.

21200572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977 (or 4975 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21200572 is about 4604.4078881003. The cubic root of 21200572 is about 276.7679898553.

Adding to 21200572 its reverse (27500212), we get a palindrome (48700784).

The spelling of 21200572 in words is "twenty-one million, two hundred thousand, five hundred seventy-two".