21203021201 has 16 divisors (see below), whose sum is σ = 22490265600. Its totient is φ = 19947175248.

The previous prime is 21203021183. The next prime is 21203021207. The reversal of 21203021201 is 10212030212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21203021201 - 2³⁰ = 20129279377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203021207) 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, 1005080 + ... + 1025958.

It is an arithmetic number, because the mean of its divisors is an integer number (1405641600).

Almost surely, 2^21203021201 is an apocalyptic number.

It is an amenable number.

21203021201 is a deficient number, since it is larger than the sum of its proper divisors (1287244399).

21203021201 is a wasteful number, since it uses less digits than its factorization.

21203021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21628.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21203021201 its reverse (10212030212), we get a palindrome (31415051413).

The spelling of 21203021201 in words is "twenty-one billion, two hundred three million, twenty-one thousand, two hundred one".