1211011210105 has 16 divisors (see below), whose sum is σ = 1503388411200. Its totient is φ = 935361846720.

The previous prime is 1211011210099. The next prime is 1211011210117. The reversal of 1211011210105 is 5010121101121.

It is not a de Polignac number, because 1211011210105 - 2¹³ = 1211011201913 is a prime.

It is a super-2 number, since 2×1211011210105² (a number of 25 digits) contains 22 as substring.

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, 3491170 + ... + 3822340.

It is an arithmetic number, because the mean of its divisors is an integer number (93961775700).

Almost surely, 2^{1211011210105} is an apocalyptic number.

It is an amenable number.

1211011210105 is a deficient number, since it is larger than the sum of its proper divisors (292377201095).

1211011210105 is a wasteful number, since it uses less digits than its factorization.

1211011210105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356424.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 1211011210105 its reverse (5010121101121), we get a palindrome (6221132311226).

The spelling of 1211011210105 in words is "one trillion, two hundred eleven billion, eleven million, two hundred ten thousand, one hundred five".