21121220022222 has 32 divisors (see below), whose sum is σ = 42456179556000. Its totient is φ = 7004871710208.

The previous prime is 21121220022163. The next prime is 21121220022223. The reversal of 21121220022222 is 22222002212112.

It is a super-2 number, since 2×21121220022222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121220022223) 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, 10078647 + ... + 11992562.

It is an arithmetic number, because the mean of its divisors is an integer number (1326755611125).

Almost surely, 2^{21121220022222} is an apocalyptic number.

21121220022222 is an abundant number, since it is smaller than the sum of its proper divisors (21334959533778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121220022222 is a wasteful number, since it uses less digits than its factorization.

21121220022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22072020.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21121220022222 its reverse (22222002212112), we get a palindrome (43343222234334).

The spelling of 21121220022222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred twenty-two".