21202097 has 4 divisors (see below), whose sum is σ = 24230976. Its totient is φ = 18173220.

The previous prime is 21202079. The next prime is 21202121. The reversal of 21202097 is 79020212.

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 a cyclic number.

It is not a de Polignac number, because 21202097 - 2⁶ = 21202033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21202037) 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, 1514429 + ... + 1514442.

It is an arithmetic number, because the mean of its divisors is an integer number (6057744).

Almost surely, 2^21202097 is an apocalyptic number.

It is an amenable number.

21202097 is a deficient number, since it is larger than the sum of its proper divisors (3028879).

21202097 is an equidigital number, since it uses as much as digits as its factorization.

21202097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028878.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21202097 is about 4604.5734873059. The cubic root of 21202097 is about 276.7746258566.

The spelling of 21202097 in words is "twenty-one million, two hundred two thousand, ninety-seven".