211221020003 has 4 divisors (see below), whose sum is σ = 241395451440. Its totient is φ = 181046588568.

The previous prime is 211221019973. The next prime is 211221020041. The reversal of 211221020003 is 300020122112.

It is a happy number.

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-211221020003 is a prime.

It is a super-2 number, since 2×211221020003² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211221020003.

It is not an unprimeable number, because it can be changed into a prime (211221020203) 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, 15087215708 + ... + 15087215721.

It is an arithmetic number, because the mean of its divisors is an integer number (60348862860).

Almost surely, 2^211221020003 is an apocalyptic number.

211221020003 is a deficient number, since it is larger than the sum of its proper divisors (30174431437).

211221020003 is an equidigital number, since it uses as much as digits as its factorization.

211221020003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174431436.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 211221020003 its reverse (300020122112), we get a palindrome (511241142115).

The spelling of 211221020003 in words is "two hundred eleven billion, two hundred twenty-one million, twenty thousand, three".