1201121111021 has 24 divisors (see below), whose sum is σ = 1358753953536. Its totient is φ = 1060034152320.

The previous prime is 1201121111011. The next prime is 1201121111081. The reversal of 1201121111021 is 1201111211021.

It is not a de Polignac number, because 1201121111021 - 2⁶ = 1201121110957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201121110987 and 1201121111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201121111011) 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 23 ways as a sum of consecutive naturals, for example, 946280 + ... + 1815953.

It is an arithmetic number, because the mean of its divisors is an integer number (56614748064).

Almost surely, 2^{1201121111021} is an apocalyptic number.

It is an amenable number.

1201121111021 is a deficient number, since it is larger than the sum of its proper divisors (157632842515).

1201121111021 is a wasteful number, since it uses less digits than its factorization.

1201121111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762373 (or 2762360 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1201121111021 its reverse (1201111211021), we get a palindrome (2402232322042).

The spelling of 1201121111021 in words is "one trillion, two hundred one billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".