121652221506 has 16 divisors (see below), whose sum is σ = 253882897344. Its totient is φ = 38787664784.

The previous prime is 121652221489. The next prime is 121652221513. The reversal of 121652221506 is 605122256121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440768781 + ... + 440769056.

It is an arithmetic number, because the mean of its divisors is an integer number (15867681084).

Almost surely, 2^121652221506 is an apocalyptic number.

121652221506 is an abundant number, since it is smaller than the sum of its proper divisors (132230675838).

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

121652221506 is a wasteful number, since it uses less digits than its factorization.

121652221506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881537865.

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 121652221506 its reverse (605122256121), we get a palindrome (726774477627).

The spelling of 121652221506 in words is "one hundred twenty-one billion, six hundred fifty-two million, two hundred twenty-one thousand, five hundred six".