211012099978 has 32 divisors (see below), whose sum is σ = 321273968400. Its totient is φ = 103932149760.

The previous prime is 211012099957. The next prime is 211012099979. The reversal of 211012099978 is 879990210112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9781803409 + 201230296569 = 98903^2 + 448587^2 .

It is a super-2 number, since 2×211012099978² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211012099979) 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, 38722198 + ... + 38727646.

Almost surely, 2^211012099978 is an apocalyptic number.

211012099978 is a deficient number, since it is larger than the sum of its proper divisors (110261868422).

211012099978 is a wasteful number, since it uses less digits than its factorization.

211012099978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 211012099978 in words is "two hundred eleven billion, twelve million, ninety-nine thousand, nine hundred seventy-eight".