121431234221 has 8 divisors (see below), whose sum is σ = 132503594688. Its totient is φ = 110364400000.

The previous prime is 121431234181. The next prime is 121431234241. The reversal of 121431234221 is 122432134121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121431234221 - 2¹⁰ = 121431233197 is a prime.

It is a super-2 number, since 2×121431234221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121431234241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1335545 + ... + 1423566.

It is an arithmetic number, because the mean of its divisors is an integer number (16562949336).

Almost surely, 2^121431234221 is an apocalyptic number.

121431234221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121431234221 is a deficient number, since it is larger than the sum of its proper divisors (11072360467).

121431234221 is a wasteful number, since it uses less digits than its factorization.

121431234221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763123.

The product of its digits is 2304, while the sum is 26.

Adding to 121431234221 its reverse (122432134121), we get a palindrome (243863368342).

The spelling of 121431234221 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred thirty-four thousand, two hundred twenty-one".