211402397 has 2 divisors, whose sum is σ = 211402398. Its totient is φ = 211402396.

The previous prime is 211402343. The next prime is 211402409. The reversal of 211402397 is 793204112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 74839801 = 11686^2 + 8651^2 .

It is a cyclic number.

It is not a de Polignac number, because 211402397 - 2¹² = 211398301 is a prime.

It is a super-3 number, since 3×211402397³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211402307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105701198 + 105701199.

It is an arithmetic number, because the mean of its divisors is an integer number (105701199).

Almost surely, 2^211402397 is an apocalyptic number.

It is an amenable number.

211402397 is a deficient number, since it is larger than the sum of its proper divisors (1).

211402397 is an equidigital number, since it uses as much as digits as its factorization.

211402397 is an odious number, because the sum of its binary digits is odd.

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

The square root of 211402397 is about 14539.6835247539. The cubic root of 211402397 is about 595.7123938911.

The spelling of 211402397 in words is "two hundred eleven million, four hundred two thousand, three hundred ninety-seven".