21443203311434 has 4 divisors (see below), whose sum is σ = 32164804967154. Its totient is φ = 10721601655716.

The previous prime is 21443203311433. The next prime is 21443203311503. The reversal of 21443203311434 is 43411330234412.

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., 13714541989225 + 7728661322209 = 3703315^2 + 2780047^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21443203311394 and 21443203311403.

It is not an unprimeable number, because it can be changed into a prime (21443203311433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360800827857 + ... + 5360800827860.

Almost surely, 2^{21443203311434} is an apocalyptic number.

21443203311434 is a deficient number, since it is larger than the sum of its proper divisors (10721601655720).

21443203311434 is a wasteful number, since it uses less digits than its factorization.

21443203311434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10721601655719.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 21443203311434 its reverse (43411330234412), we get a palindrome (64854533545846).

The spelling of 21443203311434 in words is "twenty-one trillion, four hundred forty-three billion, two hundred three million, three hundred eleven thousand, four hundred thirty-four".