21683037 has 4 divisors (see below), whose sum is σ = 28910720. Its totient is φ = 14455356.

The previous prime is 21683033. The next prime is 21683059. The reversal of 21683037 is 73038612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21683037 - 2² = 21683033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21682995 and 21683013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3613837 + ... + 3613842.

It is an arithmetic number, because the mean of its divisors is an integer number (7227680).

Almost surely, 2^21683037 is an apocalyptic number.

It is an amenable number.

21683037 is a deficient number, since it is larger than the sum of its proper divisors (7227683).

21683037 is an equidigital number, since it uses as much as digits as its factorization.

21683037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7227682.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21683037 is about 4656.5048051087. The cubic root of 21683037 is about 278.8517473952.

The spelling of 21683037 in words is "twenty-one million, six hundred eighty-three thousand, thirty-seven".