21020000221211 has 4 divisors (see below), whose sum is σ = 21020292574512. Its totient is φ = 21019707867912.

The previous prime is 21020000221183. The next prime is 21020000221237. The reversal of 21020000221211 is 11212200002012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020000221211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020000221111) 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, 146068775 + ... + 146212608.

It is an arithmetic number, because the mean of its divisors is an integer number (5255073143628).

Almost surely, 2^{21020000221211} is an apocalyptic number.

21020000221211 is a deficient number, since it is larger than the sum of its proper divisors (292353301).

21020000221211 is an equidigital number, since it uses as much as digits as its factorization.

21020000221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292353300.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020000221211 its reverse (11212200002012), we get a palindrome (32232200223223).

The spelling of 21020000221211 in words is "twenty-one trillion, twenty billion, two hundred twenty-one thousand, two hundred eleven".