101211881 has 2 divisors, whose sum is σ = 101211882. Its totient is φ = 101211880.

The previous prime is 101211857. The next prime is 101211883. The reversal of 101211881 is 188112101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 8281 = 10060^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 101211881 - 2²² = 97017577 is a prime.

It is a super-2 number, since 2×101211881² = 20487689711116322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 101211883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (101211883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605940 + 50605941.

It is an arithmetic number, because the mean of its divisors is an integer number (50605941).

Almost surely, 2^101211881 is an apocalyptic number.

It is an amenable number.

101211881 is a deficient number, since it is larger than the sum of its proper divisors (1).

101211881 is an equidigital number, since it uses as much as digits as its factorization.

101211881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

The square root of 101211881 is about 10060.4115720978. The cubic root of 101211881 is about 466.0263773927.

Adding to 101211881 its reverse (188112101), we get a palindrome (289323982).

The spelling of 101211881 in words is "one hundred one million, two hundred eleven thousand, eight hundred eighty-one".