121000020220021 has 4 divisors (see below), whose sum is σ = 122359571009100. Its totient is φ = 119640469430944.

The previous prime is 121000020220007. The next prime is 121000020220049. The reversal of 121000020220021 is 120022020000121.

It is a happy number.

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 68842880659921 + 52157139560100 = 8297161^2 + 7221990^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000020220021 - 2¹⁹ = 121000019695733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121000020219983 and 121000020220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000020220061) 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, 679775394406 + ... + 679775394583.

It is an arithmetic number, because the mean of its divisors is an integer number (30589892752275).

Almost surely, 2^{121000020220021} is an apocalyptic number.

It is an amenable number.

121000020220021 is a deficient number, since it is larger than the sum of its proper divisors (1359550789079).

121000020220021 is an equidigital number, since it uses as much as digits as its factorization.

121000020220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359550789078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121000020220021 its reverse (120022020000121), we get a palindrome (241022040220142).

The spelling of 121000020220021 in words is "one hundred twenty-one trillion, twenty million, two hundred twenty thousand, twenty-one".