21895037 has 2 divisors, whose sum is σ = 21895038. Its totient is φ = 21895036.

The previous prime is 21894991. The next prime is 21895039. The reversal of 21895037 is 73059812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 5982916 = 3989^2 + 2446^2 .

It is a cyclic number.

It is not a de Polignac number, because 21895037 - 2¹⁰ = 21894013 is a prime.

Together with 21895039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21894988 and 21895006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21895039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10947518 + 10947519.

It is an arithmetic number, because the mean of its divisors is an integer number (10947519).

Almost surely, 2^21895037 is an apocalyptic number.

It is an amenable number.

21895037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21895037 is an equidigital number, since it uses as much as digits as its factorization.

21895037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 21895037 is about 4679.2132885775. The cubic root of 21895037 is about 279.7576005866.

The spelling of 21895037 in words is "twenty-one million, eight hundred ninety-five thousand, thirty-seven".