21002203441 has 8 divisors (see below), whose sum is σ = 21607669664. Its totient is φ = 20405325600.

The previous prime is 21002203421. The next prime is 21002203447. The reversal of 21002203441 is 14430220012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002203441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002203447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2142135 + ... + 2151916.

It is an arithmetic number, because the mean of its divisors is an integer number (2700958708).

Almost surely, 2^21002203441 is an apocalyptic number.

It is an amenable number.

21002203441 is a deficient number, since it is larger than the sum of its proper divisors (605466223).

21002203441 is an equidigital number, since it uses as much as digits as its factorization.

21002203441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294191.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21002203441 its reverse (14430220012), we get a palindrome (35432423453).

The spelling of 21002203441 in words is "twenty-one billion, two million, two hundred three thousand, four hundred forty-one".