1212211012111 has 4 divisors (see below), whose sum is σ = 1322412013224. Its totient is φ = 1102010011000.

The previous prime is 1212211012097. The next prime is 1212211012151. The reversal of 1212211012111 is 1112101122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212211012111 - 2²³ = 1212202623503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211012151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55100500540 + ... + 55100500561.

It is an arithmetic number, because the mean of its divisors is an integer number (330603003306).

Almost surely, 2^{1212211012111} is an apocalyptic number.

1212211012111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212211012111 is a deficient number, since it is larger than the sum of its proper divisors (110201001113).

1212211012111 is a wasteful number, since it uses less digits than its factorization.

1212211012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110201001112.

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

Adding to 1212211012111 its reverse (1112101122121), we get a palindrome (2324312134232).

The spelling of 1212211012111 in words is "one trillion, two hundred twelve billion, two hundred eleven million, twelve thousand, one hundred eleven".