21111001211222 has 32 divisors (see below), whose sum is σ = 34571243302848. Its totient is φ = 9609593089536.

The previous prime is 21111001211213. The next prime is 21111001211231. The reversal of 21111001211222 is 22211210011112.

It is an interprime number because it is at equal distance from previous prime (21111001211213) and next prime (21111001211231).

It is a self number, because there is not a number n which added to its sum of digits gives 21111001211222.

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, 39866378 + ... + 40392450.

It is an arithmetic number, because the mean of its divisors is an integer number (1080351353214).

Almost surely, 2^{21111001211222} is an apocalyptic number.

21111001211222 is a deficient number, since it is larger than the sum of its proper divisors (13460242091626).

21111001211222 is a wasteful number, since it uses less digits than its factorization.

21111001211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547304.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111001211222 its reverse (22211210011112), we get a palindrome (43322211222334).

The spelling of 21111001211222 in words is "twenty-one trillion, one hundred eleven billion, one million, two hundred eleven thousand, two hundred twenty-two".