21022097 has 2 divisors, whose sum is σ = 21022098. Its totient is φ = 21022096.

The previous prime is 21022093. The next prime is 21022103. The reversal of 21022097 is 79022012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 1032256 = 4471^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022097 - 2² = 21022093 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21022091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511048 + 10511049.

It is an arithmetic number, because the mean of its divisors is an integer number (10511049).

Almost surely, 2^21022097 is an apocalyptic number.

It is an amenable number.

21022097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022097 is an equidigital number, since it uses as much as digits as its factorization.

21022097 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21022097 is about 4584.9860414182. The cubic root of 21022097 is about 275.9891518876.

The spelling of 21022097 in words is "twenty-one million, twenty-two thousand, ninety-seven".