212099137 has 2 divisors, whose sum is σ = 212099138. Its totient is φ = 212099136.

The previous prime is 212099131. The next prime is 212099141. The reversal of 212099137 is 731990212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205176976 + 6922161 = 14324^2 + 2631^2 .

It is a cyclic number.

It is not a de Polignac number, because 212099137 - 2¹¹ = 212097089 is a prime.

It is a super-2 number, since 2×212099137² = 89972087832289538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212099131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106049568 + 106049569.

It is an arithmetic number, because the mean of its divisors is an integer number (106049569).

Almost surely, 2^212099137 is an apocalyptic number.

It is an amenable number.

212099137 is a deficient number, since it is larger than the sum of its proper divisors (1).

212099137 is an equidigital number, since it uses as much as digits as its factorization.

212099137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 212099137 is about 14563.6237592160. The cubic root of 212099137 is about 596.3661258435.

The spelling of 212099137 in words is "two hundred twelve million, ninety-nine thousand, one hundred thirty-seven".