121440400042 has 32 divisors (see below), whose sum is σ = 196533872640. Its totient is φ = 55946419200.

The previous prime is 121440400033. The next prime is 121440400043. The reversal of 121440400042 is 240004044121.

It is a junction number, because it is equal to n+sod(n) for n = 121440399986 and 121440400022.

It is not an unprimeable number, because it can be changed into a prime (121440400043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54237559 + ... + 54239797.

It is an arithmetic number, because the mean of its divisors is an integer number (6141683520).

Almost surely, 2^121440400042 is an apocalyptic number.

121440400042 is a deficient number, since it is larger than the sum of its proper divisors (75093472598).

121440400042 is a wasteful number, since it uses less digits than its factorization.

121440400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 121440400042 its reverse (240004044121), we get a palindrome (361444444163).

The spelling of 121440400042 in words is "one hundred twenty-one billion, four hundred forty million, four hundred thousand, forty-two".