211221033013 has 4 divisors (see below), whose sum is σ = 218504516940. Its totient is φ = 203937549088.

The previous prime is 211221032989. The next prime is 211221033029. The reversal of 211221033013 is 310330122112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105366458404 + 105854574609 = 324602^2 + 325353^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221033013 - 2²¹ = 211218935861 is a prime.

It is a super-2 number, since 2×211221033013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221033043) 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, 3641741920 + ... + 3641741977.

It is an arithmetic number, because the mean of its divisors is an integer number (54626129235).

Almost surely, 2^211221033013 is an apocalyptic number.

It is an amenable number.

211221033013 is a deficient number, since it is larger than the sum of its proper divisors (7283483927).

211221033013 is an equidigital number, since it uses as much as digits as its factorization.

211221033013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283483926.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211221033013 its reverse (310330122112), we get a palindrome (521551155125).

The spelling of 211221033013 in words is "two hundred eleven billion, two hundred twenty-one million, thirty-three thousand, thirteen".