121423551201 has 32 divisors (see below), whose sum is σ = 180867840000. Its totient is φ = 80507894544.

The previous prime is 121423551173. The next prime is 121423551217. The reversal of 121423551201 is 102155324121.

It is a happy number.

121423551201 is a `hidden beast` number, since 1 + 2 + 142 + 3 + 5 + 512 + 0 + 1 = 666.

It is not a de Polignac number, because 121423551201 - 2¹¹ = 121423549153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121423651201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21591276 + ... + 21596898.

It is an arithmetic number, because the mean of its divisors is an integer number (5652120000).

Almost surely, 2^121423551201 is an apocalyptic number.

It is an amenable number.

121423551201 is a deficient number, since it is larger than the sum of its proper divisors (59444288799).

121423551201 is a wasteful number, since it uses less digits than its factorization.

121423551201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9850 (or 9844 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 121423551201 its reverse (102155324121), we get a palindrome (223578875322).

The spelling of 121423551201 in words is "one hundred twenty-one billion, four hundred twenty-three million, five hundred fifty-one thousand, two hundred one".