1021212012111 has 4 divisors (see below), whose sum is σ = 1361616016152. Its totient is φ = 680808008072.

The previous prime is 1021212012109. The next prime is 1021212012151. The reversal of 1021212012111 is 1112102121201.

It is a happy number.

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 1021212012111 - 2¹ = 1021212012109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212012151) 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, 170202002016 + ... + 170202002021.

It is an arithmetic number, because the mean of its divisors is an integer number (340404004038).

Almost surely, 2^{1021212012111} is an apocalyptic number.

1021212012111 is a deficient number, since it is larger than the sum of its proper divisors (340404004041).

1021212012111 is an equidigital number, since it uses as much as digits as its factorization.

1021212012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340404004040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1021212012111 its reverse (1112102121201), we get a palindrome (2133314133312).

The spelling of 1021212012111 in words is "one trillion, twenty-one billion, two hundred twelve million, twelve thousand, one hundred eleven".