212021113105 has 16 divisors (see below), whose sum is σ = 254705246928. Its totient is φ = 169430400000.

The previous prime is 212021113079. The next prime is 212021113163. The reversal of 212021113105 is 501311120212.

It can be written as a sum of positive squares in 8 ways, for example, as 17040384 + 212004072721 = 4128^2 + 460439^2 .

It is not a de Polignac number, because 212021113105 - 2³¹ = 209873629457 is a prime.

It is a super-5 number, since 5×212021113105⁵ (a number of 58 digits) contains 55555 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19994805 + ... + 20005405.

It is an arithmetic number, because the mean of its divisors is an integer number (15919077933).

Almost surely, 2^212021113105 is an apocalyptic number.

It is an amenable number.

212021113105 is a deficient number, since it is larger than the sum of its proper divisors (42684133823).

212021113105 is a wasteful number, since it uses less digits than its factorization.

212021113105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14628.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 212021113105 its reverse (501311120212), we get a palindrome (713332233317).

The spelling of 212021113105 in words is "two hundred twelve billion, twenty-one million, one hundred thirteen thousand, one hundred five".