21232224142 has 4 divisors (see below), whose sum is σ = 31848336216. Its totient is φ = 10616112070.

The previous prime is 21232224049. The next prime is 21232224179. The reversal of 21232224142 is 24142223212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21232224142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308056034 + ... + 5308056037.

It is an arithmetic number, because the mean of its divisors is an integer number (7962084054).

Almost surely, 2^21232224142 is an apocalyptic number.

21232224142 is a deficient number, since it is larger than the sum of its proper divisors (10616112074).

21232224142 is a wasteful number, since it uses less digits than its factorization.

21232224142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10616112073.

The product of its digits is 3072, while the sum is 25.

Adding to 21232224142 its reverse (24142223212), we get a palindrome (45374447354).

The spelling of 21232224142 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-four thousand, one hundred forty-two".