222012101211221 has 4 divisors (see below), whose sum is σ = 222013690591212. Its totient is φ = 222010511831232.

The previous prime is 222012101211217. The next prime is 222012101211247. The reversal of 222012101211221 is 122112101210222.

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 167951595028996 + 54060506182225 = 12959614^2 + 7352585^2 .

It is a cyclic number.

It is not a de Polignac number, because 222012101211221 - 2² = 222012101211217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222012101211193 and 222012101211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222012101211421) 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, 794480450 + ... + 794759843.

It is an arithmetic number, because the mean of its divisors is an integer number (55503422647803).

Almost surely, 2^{222012101211221} is an apocalyptic number.

It is an amenable number.

222012101211221 is a deficient number, since it is larger than the sum of its proper divisors (1589379991).

222012101211221 is a wasteful number, since it uses less digits than its factorization.

222012101211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589379990.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 222012101211221 its reverse (122112101210222), we get a palindrome (344124202421443).

Subtracting from 222012101211221 its reverse (122112101210222), we obtain a palindrome (99900000000999).

The spelling of 222012101211221 in words is "two hundred twenty-two trillion, twelve billion, one hundred one million, two hundred eleven thousand, two hundred twenty-one".