101211111511 has 2 divisors, whose sum is σ = 101211111512. Its totient is φ = 101211111510.

The previous prime is 101211111509. The next prime is 101211111619. The reversal of 101211111511 is 115111112101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101211111511 - 2¹ = 101211111509 is a prime.

Together with 101211111509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101211711511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605555755 + 50605555756.

It is an arithmetic number, because the mean of its divisors is an integer number (50605555756).

Almost surely, 2^101211111511 is an apocalyptic number.

101211111511 is a deficient number, since it is larger than the sum of its proper divisors (1).

101211111511 is an equidigital number, since it uses as much as digits as its factorization.

101211111511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10, while the sum is 16.

Adding to 101211111511 its reverse (115111112101), we get a palindrome (216322223612).

The spelling of 101211111511 in words is "one hundred one billion, two hundred eleven million, one hundred eleven thousand, five hundred eleven".