121012202021 has 4 divisors (see below), whose sum is σ = 121039140012. Its totient is φ = 120985264032.

The previous prime is 121012201993. The next prime is 121012202029. The reversal of 121012202021 is 120202210121.

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 117556408225 + 3455793796 = 342865^2 + 58786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121012202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012201987 and 121012202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012202029) 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, 13462256 + ... + 13471241.

It is an arithmetic number, because the mean of its divisors is an integer number (30259785003).

Almost surely, 2^121012202021 is an apocalyptic number.

It is an amenable number.

121012202021 is a deficient number, since it is larger than the sum of its proper divisors (26937991).

121012202021 is an equidigital number, since it uses as much as digits as its factorization.

121012202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26937990.

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

Adding to 121012202021 its reverse (120202210121), we get a palindrome (241214412142).

It can be divided in two parts, 12101 and 2202021, that added together give a palindrome (2214122).

The spelling of 121012202021 in words is "one hundred twenty-one billion, twelve million, two hundred two thousand, twenty-one".