21224442131434 has 4 divisors (see below), whose sum is σ = 31836663197154. Its totient is φ = 10612221065716.

The previous prime is 21224442131401. The next prime is 21224442131441. The reversal of 21224442131434 is 43413124442212.

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

It can be written as a sum of positive squares in only one way, i.e., 21222744444225 + 1697687209 = 4606815^2 + 41203^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21224442131393 and 21224442131402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306110532857 + ... + 5306110532860.

Almost surely, 2^{21224442131434} is an apocalyptic number.

21224442131434 is a deficient number, since it is larger than the sum of its proper divisors (10612221065720).

21224442131434 is a wasteful number, since it uses less digits than its factorization.

21224442131434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10612221065719.

The product of its digits is 147456, while the sum is 37.

Adding to 21224442131434 its reverse (43413124442212), we get a palindrome (64637566573646).

The spelling of 21224442131434 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred forty-two million, one hundred thirty-one thousand, four hundred thirty-four".