82121103551 has 4 divisors (see below), whose sum is σ = 82123166400. Its totient is φ = 82119040704.

The previous prime is 82121103529. The next prime is 82121103569. The reversal of 82121103551 is 15530112128.

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 82121103551 - 2²² = 82116909247 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 (82121103451) 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, 970511 + ... + 1051728.

It is an arithmetic number, because the mean of its divisors is an integer number (20530791600).

Almost surely, 2^82121103551 is an apocalyptic number.

82121103551 is a deficient number, since it is larger than the sum of its proper divisors (2062849).

82121103551 is a wasteful number, since it uses less digits than its factorization.

82121103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062848.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 82121103551 its reverse (15530112128), we get a palindrome (97651215679).

The spelling of 82121103551 in words is "eighty-two billion, one hundred twenty-one million, one hundred three thousand, five hundred fifty-one".