121200020123 has 32 divisors (see below), whose sum is σ = 150578553216. Its totient is φ = 94992611328.

The previous prime is 121200020069. The next prime is 121200020141. The reversal of 121200020123 is 321020002121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121200020123 - 2⁸ = 121200019867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200020098 and 121200020107.

It is not an unprimeable number, because it can be changed into a prime (121200020153) 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, 4346915 + ... + 4374707.

It is an arithmetic number, because the mean of its divisors is an integer number (4705579788).

Almost surely, 2^121200020123 is an apocalyptic number.

121200020123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121200020123 is a deficient number, since it is larger than the sum of its proper divisors (29378533093).

121200020123 is a wasteful number, since it uses less digits than its factorization.

121200020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28263.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 121200020123 its reverse (321020002121), we get a palindrome (442220022244).

The spelling of 121200020123 in words is "one hundred twenty-one billion, two hundred million, twenty thousand, one hundred twenty-three".