21021102201 has 16 divisors (see below), whose sum is σ = 31562477568. Its totient is φ = 12329091600.

The previous prime is 21021102107. The next prime is 21021102209. The reversal of 21021102201 is 10220112012.

It is not a de Polignac number, because 21021102201 - 2⁷ = 21021102073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021102209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10273221 + ... + 10275266.

It is an arithmetic number, because the mean of its divisors is an integer number (1972654848).

Almost surely, 2^21021102201 is an apocalyptic number.

It is an amenable number.

21021102201 is a deficient number, since it is larger than the sum of its proper divisors (10541375367).

21021102201 is a wasteful number, since it uses less digits than its factorization.

21021102201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20548532.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021102201 its reverse (10220112012), we get a palindrome (31241214213).

The spelling of 21021102201 in words is "twenty-one billion, twenty-one million, one hundred two thousand, two hundred one".