21443211203 has 4 divisors (see below), whose sum is σ = 21632974248. Its totient is φ = 21253448160.

The previous prime is 21443211199. The next prime is 21443211217. The reversal of 21443211203 is 30211234412.

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

It is a cyclic number.

It is not a de Polignac number, because 21443211203 - 2² = 21443211199 is a prime.

It is a super-2 number, since 2×21443211203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443211263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94881353 + ... + 94881578.

It is an arithmetic number, because the mean of its divisors is an integer number (5408243562).

Almost surely, 2^21443211203 is an apocalyptic number.

21443211203 is a deficient number, since it is larger than the sum of its proper divisors (189763045).

21443211203 is a wasteful number, since it uses less digits than its factorization.

21443211203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189763044.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21443211203 its reverse (30211234412), we get a palindrome (51654445615).

The spelling of 21443211203 in words is "twenty-one billion, four hundred forty-three million, two hundred eleven thousand, two hundred three".