21072050 has 24 divisors (see below), whose sum is σ = 39467712. Its totient is φ = 8370000.

The previous prime is 21072047. The next prime is 21072053. The reversal of 21072050 is 5027012.

It is an interprime number because it is at equal distance from previous prime (21072047) and next prime (21072053).

It is not an unprimeable number, because it can be changed into a prime (21072053) 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, 6155 + ... + 8945.

It is an arithmetic number, because the mean of its divisors is an integer number (1644488).

Almost surely, 2^21072050 is an apocalyptic number.

21072050 is a deficient number, since it is larger than the sum of its proper divisors (18395662).

21072050 is a wasteful number, since it uses less digits than its factorization.

21072050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21072050 is about 4590.4302630581. The cubic root of 21072050 is about 276.2075820568.

Adding to 21072050 its reverse (5027012), we get a palindrome (26099062).

The spelling of 21072050 in words is "twenty-one million, seventy-two thousand, fifty".