121232140221 has 16 divisors (see below), whose sum is σ = 171392356800. Its totient is φ = 76008774528.

The previous prime is 121232140199. The next prime is 121232140261. The reversal of 121232140221 is 122041232121.

It is a happy number.

It is not a de Polignac number, because 121232140221 - 2⁶ = 121232140157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121232140261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7754526 + ... + 7770143.

It is an arithmetic number, because the mean of its divisors is an integer number (10712022300).

Almost surely, 2^121232140221 is an apocalyptic number.

It is an amenable number.

121232140221 is a deficient number, since it is larger than the sum of its proper divisors (50160216579).

121232140221 is a wasteful number, since it uses less digits than its factorization.

121232140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15524828.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 121232140221 its reverse (122041232121), we get a palindrome (243273372342).

The spelling of 121232140221 in words is "one hundred twenty-one billion, two hundred thirty-two million, one hundred forty thousand, two hundred twenty-one".