211222397 has 2 divisors, whose sum is σ = 211222398. Its totient is φ = 211222396.

The previous prime is 211222357. The next prime is 211222469. The reversal of 211222397 is 793222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196392196 + 14830201 = 14014^2 + 3851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222397 is a prime.

It is a super-2 number, since 2×211222397² = 89229801988851218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611198 + 105611199.

It is an arithmetic number, because the mean of its divisors is an integer number (105611199).

Almost surely, 2^211222397 is an apocalyptic number.

It is an amenable number.

211222397 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222397 is an equidigital number, since it uses as much as digits as its factorization.

211222397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 211222397 is about 14533.4922506602. The cubic root of 211222397 is about 595.5432714336.

The spelling of 211222397 in words is "two hundred eleven million, two hundred twenty-two thousand, three hundred ninety-seven".