21143320441 has 16 divisors (see below), whose sum is σ = 23022193600. Its totient is φ = 19348849728.

The previous prime is 21143320433. The next prime is 21143320481. The reversal of 21143320441 is 14402334112.

It is not a de Polignac number, because 21143320441 - 2³ = 21143320433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21143320421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10470 + ... + 205903.

It is an arithmetic number, because the mean of its divisors is an integer number (1438887100).

Almost surely, 2^21143320441 is an apocalyptic number.

It is an amenable number.

21143320441 is a deficient number, since it is larger than the sum of its proper divisors (1878873159).

21143320441 is a wasteful number, since it uses less digits than its factorization.

21143320441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216568.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21143320441 its reverse (14402334112), we get a palindrome (35545654553).

The spelling of 21143320441 in words is "twenty-one billion, one hundred forty-three million, three hundred twenty thousand, four hundred forty-one".