21121031110142 has 32 divisors (see below), whose sum is σ = 32296836844800. Its totient is φ = 10356296256000.

The previous prime is 21121031110093. The next prime is 21121031110159. The reversal of 21121031110142 is 24101113012112.

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 15 ways as a sum of consecutive naturals, for example, 385949342 + ... + 386004062.

It is an arithmetic number, because the mean of its divisors is an integer number (1009276151400).

Almost surely, 2^{21121031110142} is an apocalyptic number.

21121031110142 is a deficient number, since it is larger than the sum of its proper divisors (11175805734658).

21121031110142 is a wasteful number, since it uses less digits than its factorization.

21121031110142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62672.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21121031110142 its reverse (24101113012112), we get a palindrome (45222144122254).

The spelling of 21121031110142 in words is "twenty-one trillion, one hundred twenty-one billion, thirty-one million, one hundred ten thousand, one hundred forty-two".