21850037 has 16 divisors (see below), whose sum is σ = 24499584. Its totient is φ = 19320000.

The previous prime is 21850027. The next prime is 21850039. The reversal of 21850037 is 73005812.

It is a cyclic number.

It is not a de Polignac number, because 21850037 - 2¹⁰ = 21849013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21849988 and 21850015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78743 + ... + 79019.

It is an arithmetic number, because the mean of its divisors is an integer number (1531224).

Almost surely, 2^21850037 is an apocalyptic number.

It is an amenable number.

21850037 is a deficient number, since it is larger than the sum of its proper divisors (2649547).

21850037 is a wasteful number, since it uses less digits than its factorization.

21850037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21850037 is about 4674.4023147350. The cubic root of 21850037 is about 279.5658109052.

Adding to 21850037 its reverse (73005812), we get a palindrome (94855849).

It can be divided in two parts, 21 and 850037, that added together give a palindrome (850058).

The spelling of 21850037 in words is "twenty-one million, eight hundred fifty thousand, thirty-seven".