21000202201 has 4 divisors (see below), whose sum is σ = 22909311504. Its totient is φ = 19091092900.

The previous prime is 21000202169. The next prime is 21000202213. The reversal of 21000202201 is 10220200012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21000202201 - 2⁵ = 21000202169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000202241) 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, 954554635 + ... + 954554656.

It is an arithmetic number, because the mean of its divisors is an integer number (5727327876).

Almost surely, 2^21000202201 is an apocalyptic number.

It is an amenable number.

21000202201 is a deficient number, since it is larger than the sum of its proper divisors (1909109303).

21000202201 is a wasteful number, since it uses less digits than its factorization.

21000202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909109302.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000202201 its reverse (10220200012), we get a palindrome (31220402213).

The spelling of 21000202201 in words is "twenty-one billion, two hundred two thousand, two hundred one".