21021222222222 has 16 divisors (see below), whose sum is σ = 42042535338960. Its totient is φ = 7007058924992.

The previous prime is 21021222222197. The next prime is 21021222222239. The reversal of 21021222222222 is 22222222212012.

21021222222222 is a modest number, since divided by 2222222 gives 2102122 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21021222222192 and 21021222222201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570597 + ... + 6509072.

It is an arithmetic number, because the mean of its divisors is an integer number (2627658458685).

Almost surely, 2^{21021222222222} is an apocalyptic number.

21021222222222 is an abundant number, since it is smaller than the sum of its proper divisors (21021313116738).

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

21021222222222 is a wasteful number, since it uses less digits than its factorization.

21021222222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7574547.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21021222222222 its reverse (22222222212012), we get a palindrome (43243444434234).

The spelling of 21021222222222 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".