102211391 has 2 divisors, whose sum is σ = 102211392. Its totient is φ = 102211390.

The previous prime is 102211363. The next prime is 102211397. The reversal of 102211391 is 193112201.

It is a strong prime.

It is an emirp because it is prime and its reverse (193112201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102211391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102211397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51105695 + 51105696.

It is an arithmetic number, because the mean of its divisors is an integer number (51105696).

Almost surely, 2^102211391 is an apocalyptic number.

102211391 is a deficient number, since it is larger than the sum of its proper divisors (1).

102211391 is an equidigital number, since it uses as much as digits as its factorization.

102211391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 102211391 is about 10109.9649356464. The cubic root of 102211391 is about 467.5554240485. Note that the first 3 decimals are identical.

Adding to 102211391 its reverse (193112201), we get a palindrome (295323592).

The spelling of 102211391 in words is "one hundred two million, two hundred eleven thousand, three hundred ninety-one".