21005063604201 has 32 divisors (see below), whose sum is σ = 30256992115200. Its totient is φ = 12921515038080.

The previous prime is 21005063604197. The next prime is 21005063604211. The reversal of 21005063604201 is 10240636050012.

It is not a de Polignac number, because 21005063604201 - 2² = 21005063604197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21005063604211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30559815 + ... + 31239596.

It is an arithmetic number, because the mean of its divisors is an integer number (945531003600).

Almost surely, 2^{21005063604201} is an apocalyptic number.

It is an amenable number.

21005063604201 is a deficient number, since it is larger than the sum of its proper divisors (9251928510999).

21005063604201 is a wasteful number, since it uses less digits than its factorization.

21005063604201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61799589.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21005063604201 its reverse (10240636050012), we get a palindrome (31245699654213).

The spelling of 21005063604201 in words is "twenty-one trillion, five billion, sixty-three million, six hundred four thousand, two hundred one".