21111222120222 has 32 divisors (see below), whose sum is σ = 46148986138752. Its totient is φ = 6398808999264.

The previous prime is 21111222120193. The next prime is 21111222120257. The reversal of 21111222120222 is 22202122211112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2019820848 + ... + 2019831299.

It is an arithmetic number, because the mean of its divisors is an integer number (1442155816836).

Almost surely, 2^{21111222120222} is an apocalyptic number.

21111222120222 is an abundant number, since it is smaller than the sum of its proper divisors (25037764018530).

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

21111222120222 is a wasteful number, since it uses less digits than its factorization.

21111222120222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039652232.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21111222120222 its reverse (22202122211112), we get a palindrome (43313344331334).

The spelling of 21111222120222 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-two".