101211121987 has 16 divisors (see below), whose sum is σ = 108788787072. Its totient is φ = 93814554240.

The previous prime is 101211121961. The next prime is 101211122053. The reversal of 101211121987 is 789121112101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 101211121987 - 2¹⁹ = 101210597699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101211125987) 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 in 15 ways as a sum of consecutive naturals, for example, 7477608 + ... + 7491130.

It is an arithmetic number, because the mean of its divisors is an integer number (6799299192).

Almost surely, 2^101211121987 is an apocalyptic number.

101211121987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

101211121987 is a deficient number, since it is larger than the sum of its proper divisors (7577665085).

101211121987 is a wasteful number, since it uses less digits than its factorization.

101211121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 101211121987 in words is "one hundred one billion, two hundred eleven million, one hundred twenty-one thousand, nine hundred eighty-seven".