121030043221 has 4 divisors (see below), whose sum is σ = 122140410700. Its totient is φ = 119919675744.

The previous prime is 121030043207. The next prime is 121030043257. The reversal of 121030043221 is 122340030121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122340030121 = 237283 ⋅515587.

It can be written as a sum of positive squares in 2 ways, for example, as 28059935121 + 92970108100 = 167511^2 + 304910^2 .

It is a cyclic number.

It is not a de Polignac number, because 121030043221 - 2²³ = 121021654613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121030043261) 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, 555183576 + ... + 555183793.

It is an arithmetic number, because the mean of its divisors is an integer number (30535102675).

Almost surely, 2^121030043221 is an apocalyptic number.

It is an amenable number.

121030043221 is a deficient number, since it is larger than the sum of its proper divisors (1110367479).

121030043221 is a wasteful number, since it uses less digits than its factorization.

121030043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110367478.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 121030043221 its reverse (122340030121), we get a palindrome (243370073342).

It can be divided in two parts, 1210300 and 43221, that added together give a palindrome (1253521).

The spelling of 121030043221 in words is "one hundred twenty-one billion, thirty million, forty-three thousand, two hundred twenty-one".