1201212111 has 16 divisors (see below), whose sum is σ = 1756879488. Its totient is φ = 723981600.

The previous prime is 1201212109. The next prime is 1201212127. The reversal of 1201212111 is 1112121021.

1201212111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1201212111 - 2¹ = 1201212109 is a prime.

It is a super-2 number, since 2×1201212111² = 2885821071226152642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94581 + ... + 106526.

It is an arithmetic number, because the mean of its divisors is an integer number (109804968).

Almost surely, 2^1201212111 is an apocalyptic number.

1201212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1201212111 is a deficient number, since it is larger than the sum of its proper divisors (555667377).

1201212111 is a wasteful number, since it uses less digits than its factorization.

1201212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201302.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1201212111 is about 34658.5070509392. The cubic root of 1201212111 is about 1063.0162432653.

Adding to 1201212111 its reverse (1112121021), we get a palindrome (2313333132).

It can be divided in two parts, 1201 and 212111, that added together give a palindrome (213312).

The spelling of 1201212111 in words is "one billion, two hundred one million, two hundred twelve thousand, one hundred eleven".