221121211201211 has 4 divisors (see below), whose sum is σ = 221600866757424. Its totient is φ = 220641555645000.

The previous prime is 221121211201201. The next prime is 221121211201213. The reversal of 221121211201211 is 112102112121122.

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 221121211201211 - 2⁴² = 216723164690107 is a prime.

It is a super-2 number, since 2×221121211201211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121211201213) 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, 239827777415 + ... + 239827778336.

It is an arithmetic number, because the mean of its divisors is an integer number (55400216689356).

Almost surely, 2^{221121211201211} is an apocalyptic number.

221121211201211 is a deficient number, since it is larger than the sum of its proper divisors (479655556213).

221121211201211 is an equidigital number, since it uses as much as digits as its factorization.

221121211201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479655556212.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221121211201211 its reverse (112102112121122), we get a palindrome (333223323322333).

The spelling of 221121211201211 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred eleven".