21038197 has 8 divisors (see below), whose sum is σ = 22334400. Its totient is φ = 19748544.

The previous prime is 21038183. The next prime is 21038203. The reversal of 21038197 is 79183012.

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

It is a cyclic number.

It is not a de Polignac number, because 21038197 - 2¹¹ = 21036149 is a prime.

It is a super-4 number, since 4×21038197⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038117) 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, 6054 + ... + 8872.

It is an arithmetic number, because the mean of its divisors is an integer number (2791800).

Almost surely, 2^21038197 is an apocalyptic number.

It is an amenable number.

21038197 is a deficient number, since it is larger than the sum of its proper divisors (1296203).

21038197 is a wasteful number, since it uses less digits than its factorization.

21038197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3275.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 21038197 is about 4586.7414359216. The cubic root of 21038197 is about 276.0595903327.

The spelling of 21038197 in words is "twenty-one million, thirty-eight thousand, one hundred ninety-seven".