21201202443 has 8 divisors (see below), whose sum is σ = 28273210000. Its totient is φ = 14131664928.

The previous prime is 21201202397. The next prime is 21201202447. The reversal of 21201202443 is 34420210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201202443 - 2²² = 21197008139 is a prime.

It is a super-3 number, since 3×21201202443³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201202447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597388 + ... + 631881.

It is an arithmetic number, because the mean of its divisors is an integer number (3534151250).

Almost surely, 2^21201202443 is an apocalyptic number.

21201202443 is a deficient number, since it is larger than the sum of its proper divisors (7072007557).

21201202443 is a wasteful number, since it uses less digits than its factorization.

21201202443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235021.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21201202443 its reverse (34420210212), we get a palindrome (55621412655).

The spelling of 21201202443 in words is "twenty-one billion, two hundred one million, two hundred two thousand, four hundred forty-three".