21133121110 has 8 divisors (see below), whose sum is σ = 38039618016. Its totient is φ = 8453248440.

The previous prime is 21133121081. The next prime is 21133121131. The reversal of 21133121110 is 1112133112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056656046 + ... + 1056656065.

It is an arithmetic number, because the mean of its divisors is an integer number (4754952252).

Almost surely, 2^21133121110 is an apocalyptic number.

21133121110 is a deficient number, since it is larger than the sum of its proper divisors (16906496906).

21133121110 is a wasteful number, since it uses less digits than its factorization.

21133121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113312118.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21133121110 its reverse (1112133112), we get a palindrome (22245254222).

The spelling of 21133121110 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-one thousand, one hundred ten".