21102202020201 has 4 divisors (see below), whose sum is σ = 28136269360272. Its totient is φ = 14068134680132.

The previous prime is 21102202020187. The next prime is 21102202020269. The reversal of 21102202020201 is 10202020220112.

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 a cyclic number.

It is not a de Polignac number, because 21102202020201 - 2¹⁹ = 21102201495913 is a prime.

It is a super-2 number, since 2×21102202020201² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102202020101) 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, 3517033670031 + ... + 3517033670036.

It is an arithmetic number, because the mean of its divisors is an integer number (7034067340068).

Almost surely, 2^{21102202020201} is an apocalyptic number.

It is an amenable number.

21102202020201 is a deficient number, since it is larger than the sum of its proper divisors (7034067340071).

21102202020201 is an equidigital number, since it uses as much as digits as its factorization.

21102202020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034067340070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102202020201 its reverse (10202020220112), we get a palindrome (31304222240313).

The spelling of 21102202020201 in words is "twenty-one trillion, one hundred two billion, two hundred two million, twenty thousand, two hundred one".