121101220021 has 16 divisors (see below), whose sum is σ = 122819587200. Its totient is φ = 119394733248.

The previous prime is 121101220001. The next prime is 121101220027. The reversal of 121101220021 is 120022101121.

It is not a de Polignac number, because 121101220021 - 2²¹ = 121099122869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121101219983 and 121101220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37502635 + ... + 37505863.

It is an arithmetic number, because the mean of its divisors is an integer number (7676224200).

Almost surely, 2^121101220021 is an apocalyptic number.

It is an amenable number.

121101220021 is a deficient number, since it is larger than the sum of its proper divisors (1718367179).

121101220021 is a wasteful number, since it uses less digits than its factorization.

121101220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121101220021 its reverse (120022101121), we get a palindrome (241123321142).

The spelling of 121101220021 in words is "one hundred twenty-one billion, one hundred one million, two hundred twenty thousand, twenty-one".