211101102019978 has 8 divisors (see below), whose sum is σ = 317063423712420. Its totient is φ = 105413294115840.

The previous prime is 211101102019937. The next prime is 211101102019999. The reversal of 211101102019978 is 879910201101112.

It can be written as a sum of positive squares in 2 ways, for example, as 209475341867169 + 1625760152809 = 14473263^2 + 1275053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211101102019978² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68628445153 + ... + 68628448228.

Almost surely, 2^{211101102019978} is an apocalyptic number.

211101102019978 is a deficient number, since it is larger than the sum of its proper divisors (105962321692442).

211101102019978 is a wasteful number, since it uses less digits than its factorization.

211101102019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137256894152.

The product of its (nonzero) digits is 18144, while the sum is 43.

The spelling of 211101102019978 in words is "two hundred eleven trillion, one hundred one billion, one hundred two million, nineteen thousand, nine hundred seventy-eight".