1201021122121 has 4 divisors (see below), whose sum is σ = 1201043206852. Its totient is φ = 1200999037392.

The previous prime is 1201021122097. The next prime is 1201021122131. The reversal of 1201021122121 is 1212211201021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 897634974096 + 303386148025 = 947436^2 + 550805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201021122121 - 2³³ = 1192431187529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201021122095 and 1201021122104.

It is not an unprimeable number, because it can be changed into a prime (1201021122131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10960590 + ... + 11069623.

It is an arithmetic number, because the mean of its divisors is an integer number (300260801713).

Almost surely, 2^{1201021122121} is an apocalyptic number.

It is an amenable number.

1201021122121 is a deficient number, since it is larger than the sum of its proper divisors (22084731).

1201021122121 is an equidigital number, since it uses as much as digits as its factorization.

1201021122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22084730.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1201021122121 its reverse (1212211201021), we get a palindrome (2413232323142).

The spelling of 1201021122121 in words is "one trillion, two hundred one billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".