211021020105 has 32 divisors (see below), whose sum is σ = 386746060800. Its totient is φ = 96246988992.

The previous prime is 211021020097. The next prime is 211021020137. The reversal of 211021020105 is 501020120112.

211021020105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211021020105 - 2³ = 211021020097 is a prime.

It is a super-2 number, since 2×211021020105² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2242885 + ... + 2335074.

It is an arithmetic number, because the mean of its divisors is an integer number (12085814400).

Almost surely, 2^211021020105 is an apocalyptic number.

It is an amenable number.

211021020105 is a deficient number, since it is larger than the sum of its proper divisors (175725040695).

211021020105 is a wasteful number, since it uses less digits than its factorization.

211021020105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578413.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 211021020105 its reverse (501020120112), we get a palindrome (712041140217).

The spelling of 211021020105 in words is "two hundred eleven billion, twenty-one million, twenty thousand, one hundred five".