21164037 has 8 divisors (see below), whose sum is σ = 28981536. Its totient is φ = 13727952.

The previous prime is 21164029. The next prime is 21164047. The reversal of 21164037 is 73046112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21164037 - 2³ = 21164029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21163998 and 21164016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95223 + ... + 95444.

It is an arithmetic number, because the mean of its divisors is an integer number (3622692).

Almost surely, 2^21164037 is an apocalyptic number.

It is an amenable number.

21164037 is a deficient number, since it is larger than the sum of its proper divisors (7817499).

21164037 is a wasteful number, since it uses less digits than its factorization.

21164037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190707.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21164037 is about 4600.4387834206. The cubic root of 21164037 is about 276.6089134463.

The spelling of 21164037 in words is "twenty-one million, one hundred sixty-four thousand, thirty-seven".