21212220022 has 16 divisors (see below), whose sum is σ = 37536832512. Its totient is φ = 8797694760.

The previous prime is 21212220017. The next prime is 21212220031. The reversal of 21212220022 is 22002221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212219978 and 21212220005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24437608 + ... + 24438475.

It is an arithmetic number, because the mean of its divisors is an integer number (2346052032).

Almost surely, 2^21212220022 is an apocalyptic number.

21212220022 is a deficient number, since it is larger than the sum of its proper divisors (16324612490).

21212220022 is a wasteful number, since it uses less digits than its factorization.

21212220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48876123.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21212220022 its reverse (22002221212), we get a palindrome (43214441234).

The spelling of 21212220022 in words is "twenty-one billion, two hundred twelve million, two hundred twenty thousand, twenty-two".