121221102142 has 32 divisors (see below), whose sum is σ = 212300310528. Its totient is φ = 50829467136.

The previous prime is 121221102097. The next prime is 121221102143. The reversal of 121221102142 is 241201122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221102143) 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, 2034783 + ... + 2093509.

It is an arithmetic number, because the mean of its divisors is an integer number (6634384704).

Almost surely, 2^121221102142 is an apocalyptic number.

121221102142 is a deficient number, since it is larger than the sum of its proper divisors (91079208386).

121221102142 is a wasteful number, since it uses less digits than its factorization.

121221102142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61920.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221102142 its reverse (241201122121), we get a palindrome (362422224263).

The spelling of 121221102142 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred forty-two".