21202011210001 has 4 divisors (see below), whose sum is σ = 21238130480112. Its totient is φ = 21165891939892.

The previous prime is 21202011209993. The next prime is 21202011210013. The reversal of 21202011210001 is 10001211020212.

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 21202011210001 - 2³ = 21202011209993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202011213001) 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, 18059634175 + ... + 18059635348.

It is an arithmetic number, because the mean of its divisors is an integer number (5309532620028).

Almost surely, 2^{21202011210001} is an apocalyptic number.

It is an amenable number.

21202011210001 is a deficient number, since it is larger than the sum of its proper divisors (36119270111).

21202011210001 is an equidigital number, since it uses as much as digits as its factorization.

21202011210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36119270110.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21202011210001 its reverse (10001211020212), we get a palindrome (31203222230213).

The spelling of 21202011210001 in words is "twenty-one trillion, two hundred two billion, eleven million, two hundred ten thousand, one".