121223513142 has 56 divisors (see below), whose sum is σ = 279996643056. Its totient is φ = 39315716496.

The previous prime is 121223513129. The next prime is 121223513143. The reversal of 121223513142 is 241315322121.

It is a happy number.

121223513142 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 2 + 3 + 513 + 142 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121223513143) 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 27 ways as a sum of consecutive naturals, for example, 1069618 + ... + 1177509.

Almost surely, 2^121223513142 is an apocalyptic number.

121223513142 is an abundant number, since it is smaller than the sum of its proper divisors (158773129914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121223513142 is an equidigital number, since it uses as much as digits as its factorization.

121223513142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247184 (or 2247169 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 121223513142 its reverse (241315322121), we get a palindrome (362538835263).

The spelling of 121223513142 in words is "one hundred twenty-one billion, two hundred twenty-three million, five hundred thirteen thousand, one hundred forty-two".