1201131121021 has 32 divisors (see below), whose sum is σ = 1313238080000. Its totient is φ = 1091973788928.

The previous prime is 1201131121013. The next prime is 1201131121033. The reversal of 1201131121021 is 1201211311021.

It is a happy number.

It is not a de Polignac number, because 1201131121021 - 2³ = 1201131121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201131120986 and 1201131121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201131121081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502774495 + ... + 502776883.

It is an arithmetic number, because the mean of its divisors is an integer number (41038690000).

Almost surely, 2^{1201131121021} is an apocalyptic number.

It is an amenable number.

1201131121021 is a deficient number, since it is larger than the sum of its proper divisors (112106958979).

1201131121021 is a wasteful number, since it uses less digits than its factorization.

1201131121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1201131121021 its reverse (1201211311021), we get a palindrome (2402342432042).

The spelling of 1201131121021 in words is "one trillion, two hundred one billion, one hundred thirty-one million, one hundred twenty-one thousand, twenty-one".