21326037 has 16 divisors (see below), whose sum is σ = 31234560. Its totient is φ = 12882672.

The previous prime is 21326021. The next prime is 21326069. The reversal of 21326037 is 73062312.

It is not a de Polignac number, because 21326037 - 2⁴ = 21326021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21325998 and 21326016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326017) 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, 6823 + ... + 9444.

It is an arithmetic number, because the mean of its divisors is an integer number (1952160).

Almost surely, 2^21326037 is an apocalyptic number.

It is an amenable number.

21326037 is a deficient number, since it is larger than the sum of its proper divisors (9908523).

21326037 is a wasteful number, since it uses less digits than its factorization.

21326037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16312.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21326037 is about 4618.0122347174. The cubic root of 21326037 is about 277.3128874163.

Adding to 21326037 its reverse (73062312), we get a palindrome (94388349).

The spelling of 21326037 in words is "twenty-one million, three hundred twenty-six thousand, thirty-seven".