21220221002011 has 4 divisors (see below), whose sum is σ = 21519097354224. Its totient is φ = 20921344649800.

The previous prime is 21220221002003. The next prime is 21220221002021. The reversal of 21220221002011 is 11020012202212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21220221002011 - 2³ = 21220221002003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220221002021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149438176000 + ... + 149438176141.

It is an arithmetic number, because the mean of its divisors is an integer number (5379774338556).

Almost surely, 2^{21220221002011} is an apocalyptic number.

21220221002011 is a deficient number, since it is larger than the sum of its proper divisors (298876352213).

21220221002011 is an equidigital number, since it uses as much as digits as its factorization.

21220221002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298876352212.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220221002011 its reverse (11020012202212), we get a palindrome (32240233204223).

The spelling of 21220221002011 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two thousand, eleven".