121120220021 has 4 divisors (see below), whose sum is σ = 121502303052. Its totient is φ = 120738136992.

The previous prime is 121120219993. The next prime is 121120220027. The reversal of 121120220021 is 120022021121.

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 33793468900 + 87326751121 = 183830^2 + 295511^2 .

It is a cyclic number.

It is not a de Polignac number, because 121120220021 - 2³⁴ = 103940350837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121120219978 and 121120220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120220027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191041040 + ... + 191041673.

It is an arithmetic number, because the mean of its divisors is an integer number (30375575763).

Almost surely, 2^121120220021 is an apocalyptic number.

It is an amenable number.

121120220021 is a deficient number, since it is larger than the sum of its proper divisors (382083031).

121120220021 is an equidigital number, since it uses as much as digits as its factorization.

121120220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382083030.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121120220021 its reverse (120022021121), we get a palindrome (241142241142).

The spelling of 121120220021 in words is "one hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, twenty-one".