21202197 has 8 divisors (see below), whose sum is σ = 28733280. Its totient is φ = 13902960.

The previous prime is 21202189. The next prime is 21202199. The reversal of 21202197 is 79120212.

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

It is not a de Polignac number, because 21202197 - 2³ = 21202189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202199) 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, 57747 + ... + 58112.

It is an arithmetic number, because the mean of its divisors is an integer number (3591660).

Almost surely, 2^21202197 is an apocalyptic number.

It is an amenable number.

21202197 is a deficient number, since it is larger than the sum of its proper divisors (7531083).

21202197 is a wasteful number, since it uses less digits than its factorization.

21202197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115923.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21202197 is about 4604.5843460621. The cubic root of 21202197 is about 276.7750609931.

The spelling of 21202197 in words is "twenty-one million, two hundred two thousand, one hundred ninety-seven".