221121202211 has 16 divisors (see below), whose sum is σ = 272189347584. Its totient is φ = 174927212064.

The previous prime is 221121202193. The next prime is 221121202219. The reversal of 221121202211 is 112202121122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121202211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221121202211.

It is not an unprimeable number, because it can be changed into a prime (221121202219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452636 + ... + 804438.

It is an arithmetic number, because the mean of its divisors is an integer number (17011834224).

Almost surely, 2^221121202211 is an apocalyptic number.

221121202211 is a deficient number, since it is larger than the sum of its proper divisors (51068145373).

221121202211 is a wasteful number, since it uses less digits than its factorization.

221121202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358730.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221121202211 its reverse (112202121122), we get a palindrome (333323323333).

The spelling of 221121202211 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred eleven".