211513200221 has 4 divisors (see below), whose sum is σ = 211593534492. Its totient is φ = 211432865952.

The previous prime is 211513200211. The next prime is 211513200251. The reversal of 211513200221 is 122002315112.

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 72299143225 + 139214056996 = 268885^2 + 373114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211513200221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211513200193 and 211513200202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211513200211) 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, 40163186 + ... + 40168451.

It is an arithmetic number, because the mean of its divisors is an integer number (52898383623).

Almost surely, 2^211513200221 is an apocalyptic number.

It is an amenable number.

211513200221 is a deficient number, since it is larger than the sum of its proper divisors (80334271).

211513200221 is an equidigital number, since it uses as much as digits as its factorization.

211513200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80334270.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 211513200221 its reverse (122002315112), we get a palindrome (333515515333).

The spelling of 211513200221 in words is "two hundred eleven billion, five hundred thirteen million, two hundred thousand, two hundred twenty-one".