121201111021 has 32 divisors (see below), whose sum is σ = 127269273600. Its totient is φ = 115329956160.

The previous prime is 121201111013. The next prime is 121201111033. The reversal of 121201111021 is 120111102121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121201111021 - 2³ = 121201111013 is a prime.

It is a super-3 number, since 3×121201111021³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201110992 and 121201111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201111621) 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, 147625791 + ... + 147626611.

It is an arithmetic number, because the mean of its divisors is an integer number (3977164800).

Almost surely, 2^121201111021 is an apocalyptic number.

It is an amenable number.

121201111021 is a deficient number, since it is larger than the sum of its proper divisors (6068162579).

121201111021 is a wasteful number, since it uses less digits than its factorization.

121201111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121201111021 its reverse (120111102121), we get a palindrome (241312213142).

The spelling of 121201111021 in words is "one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, twenty-one".