121420232155 has 4 divisors (see below), whose sum is σ = 145704278592. Its totient is φ = 97136185720.

The previous prime is 121420232137. The next prime is 121420232161. The reversal of 121420232155 is 551232024121.

It is a happy number.

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

It is not a de Polignac number, because 121420232155 - 2⁹ = 121420231643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12142023211 + ... + 12142023220.

It is an arithmetic number, because the mean of its divisors is an integer number (36426069648).

Almost surely, 2^121420232155 is an apocalyptic number.

121420232155 is a deficient number, since it is larger than the sum of its proper divisors (24284046437).

121420232155 is an equidigital number, since it uses as much as digits as its factorization.

121420232155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24284046436.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 121420232155 its reverse (551232024121), we get a palindrome (672652256276).

The spelling of 121420232155 in words is "one hundred twenty-one billion, four hundred twenty million, two hundred thirty-two thousand, one hundred fifty-five".