121111202212021 has 16 divisors (see below), whose sum is σ = 148618883255040. Its totient is φ = 96327053948160.

The previous prime is 121111202212019. The next prime is 121111202212051. The reversal of 121111202212021 is 120212202111121.

It is a happy number.

It is not a de Polignac number, because 121111202212021 - 2¹ = 121111202212019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121111202212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111202212051) 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, 7167183066 + ... + 7167199963.

It is an arithmetic number, because the mean of its divisors is an integer number (9288680203440).

Almost surely, 2^{121111202212021} is an apocalyptic number.

It is an amenable number.

121111202212021 is a deficient number, since it is larger than the sum of its proper divisors (27507681043019).

121111202212021 is a wasteful number, since it uses less digits than its factorization.

121111202212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14334383124.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121111202212021 its reverse (120212202111121), we get a palindrome (241323404323142).

The spelling of 121111202212021 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred two million, two hundred twelve thousand, twenty-one".