21122120222 has 24 divisors (see below), whose sum is σ = 38795734440. Its totient is φ = 8575897680.

The previous prime is 21122120209. The next prime is 21122120231. The reversal of 21122120222 is 22202122112.

It is a happy number.

It is a super-2 number, since 2×21122120222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122120222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5670029 + ... + 5673752.

It is an arithmetic number, because the mean of its divisors is an integer number (1616488935).

Almost surely, 2^21122120222 is an apocalyptic number.

21122120222 is a deficient number, since it is larger than the sum of its proper divisors (17673614218).

21122120222 is a wasteful number, since it uses less digits than its factorization.

21122120222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11343816 (or 11343809 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21122120222 its reverse (22202122112), we get a palindrome (43324242334).

The spelling of 21122120222 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred twenty-two".