21012102201 has 4 divisors (see below), whose sum is σ = 28016136272. Its totient is φ = 14008068132.

The previous prime is 21012102193. The next prime is 21012102211. The reversal of 21012102201 is 10220121012.

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 21012102201 - 2³ = 21012102193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012102211) 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, 3502017031 + ... + 3502017036.

It is an arithmetic number, because the mean of its divisors is an integer number (7004034068).

Almost surely, 2^21012102201 is an apocalyptic number.

It is an amenable number.

21012102201 is a deficient number, since it is larger than the sum of its proper divisors (7004034071).

21012102201 is an equidigital number, since it uses as much as digits as its factorization.

21012102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004034070.

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

Adding to 21012102201 its reverse (10220121012), we get a palindrome (31232223213).

It can be divided in two parts, 21012 and 102201, that multiplied together give a palindrome (2147447412).

The spelling of 21012102201 in words is "twenty-one billion, twelve million, one hundred two thousand, two hundred one".