21133121242 has 8 divisors (see below), whose sum is σ = 31995940896. Its totient is φ = 10467807612.

The previous prime is 21133121239. The next prime is 21133121267. The reversal of 21133121242 is 24212133112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49376238 + ... + 49376665.

It is an arithmetic number, because the mean of its divisors is an integer number (3999492612).

Almost surely, 2^21133121242 is an apocalyptic number.

21133121242 is a deficient number, since it is larger than the sum of its proper divisors (10862819654).

21133121242 is a wasteful number, since it uses less digits than its factorization.

21133121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98753012.

The product of its digits is 576, while the sum is 22.

Adding to 21133121242 its reverse (24212133112), we get a palindrome (45345254354).

The spelling of 21133121242 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-one thousand, two hundred forty-two".