222222122121111 has 32 divisors (see below), whose sum is σ = 356477915619840. Its totient is φ = 120290098857984.

The previous prime is 222222122121023. The next prime is 222222122121137. The reversal of 222222122121111 is 111121221222222.

It is not a de Polignac number, because 222222122121111 - 2¹³ = 222222122112919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222122121211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19998810 + ... + 29058503.

It is an arithmetic number, because the mean of its divisors is an integer number (11139934863120).

Almost surely, 2^{222222122121111} is an apocalyptic number.

222222122121111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

222222122121111 is a deficient number, since it is larger than the sum of its proper divisors (134255793498729).

222222122121111 is a wasteful number, since it uses less digits than its factorization.

222222122121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49068695.

The product of its digits is 512, while the sum is 24.

Adding to 222222122121111 its reverse (111121221222222), we get a palindrome (333343343343333).

The spelling of 222222122121111 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".