121533511142 has 16 divisors (see below), whose sum is σ = 186199100352. Its totient is φ = 59467423680.

The previous prime is 121533511111. The next prime is 121533511157. The reversal of 121533511142 is 241115335121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872642 + ... + 1002282.

It is an arithmetic number, because the mean of its divisors is an integer number (11637443772).

Almost surely, 2^121533511142 is an apocalyptic number.

121533511142 is a deficient number, since it is larger than the sum of its proper divisors (64665589210).

121533511142 is a wasteful number, since it uses less digits than its factorization.

121533511142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139663.

The product of its digits is 3600, while the sum is 29.

Adding to 121533511142 its reverse (241115335121), we get a palindrome (362648846263).

The spelling of 121533511142 in words is "one hundred twenty-one billion, five hundred thirty-three million, five hundred eleven thousand, one hundred forty-two".