21852037 has 2 divisors, whose sum is σ = 21852038. Its totient is φ = 21852036.

The previous prime is 21852029. The next prime is 21852067. The reversal of 21852037 is 73025812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20666116 + 1185921 = 4546^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 21852037 - 2³ = 21852029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21851996 and 21852014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21852067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926018 + 10926019.

It is an arithmetic number, because the mean of its divisors is an integer number (10926019).

Almost surely, 2^21852037 is an apocalyptic number.

It is an amenable number.

21852037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21852037 is an equidigital number, since it uses as much as digits as its factorization.

21852037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21852037 is about 4674.6162409336. The cubic root of 21852037 is about 279.5743404799.

Adding to 21852037 its reverse (73025812), we get a palindrome (94877849).

The spelling of 21852037 in words is "twenty-one million, eight hundred fifty-two thousand, thirty-seven".