121732322551 has 4 divisors (see below), whose sum is σ = 139122654352. Its totient is φ = 104341990752.

The previous prime is 121732322531. The next prime is 121732322557. The reversal of 121732322551 is 155223237121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121732322551 - 2²¹ = 121730225399 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 (121732322557) 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, 8695165890 + ... + 8695165903.

It is an arithmetic number, because the mean of its divisors is an integer number (34780663588).

Almost surely, 2^121732322551 is an apocalyptic number.

121732322551 is a deficient number, since it is larger than the sum of its proper divisors (17390331801).

121732322551 is an equidigital number, since it uses as much as digits as its factorization.

121732322551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17390331800.

The product of its digits is 25200, while the sum is 34.

Adding to 121732322551 its reverse (155223237121), we get a palindrome (276955559672).

The spelling of 121732322551 in words is "one hundred twenty-one billion, seven hundred thirty-two million, three hundred twenty-two thousand, five hundred fifty-one".