121351543432 has 64 divisors (see below), whose sum is σ = 265289126400. Its totient is φ = 50968135680.

The previous prime is 121351543421. The next prime is 121351543457. The reversal of 121351543432 is 234345153121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455457 + ... + 670927.

It is an arithmetic number, because the mean of its divisors is an integer number (4145142600).

Almost surely, 2^121351543432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121351543432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132644563200).

121351543432 is an abundant number, since it is smaller than the sum of its proper divisors (143937582968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121351543432 is a wasteful number, since it uses less digits than its factorization.

121351543432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215686 (or 215682 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

Adding to 121351543432 its reverse (234345153121), we get a palindrome (355696696553).

The spelling of 121351543432 in words is "one hundred twenty-one billion, three hundred fifty-one million, five hundred forty-three thousand, four hundred thirty-two".