21222111012112 has 10 divisors (see below), whose sum is σ = 41117840085998. Its totient is φ = 10611055506048.

The previous prime is 21222111012103. The next prime is 21222111012121. The reversal of 21222111012112 is 21121011122212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21222111012103) and next prime (21222111012121).

It can be written as a sum of positive squares in only one way, i.e., 13219797897216 + 8002313114896 = 3635904^2 + 2828836^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222111012112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663190969113 + ... + 663190969144.

Almost surely, 2^{21222111012112} is an apocalyptic number.

It is an amenable number.

21222111012112 is a deficient number, since it is larger than the sum of its proper divisors (19895729073886).

21222111012112 is a wasteful number, since it uses less digits than its factorization.

21222111012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326381938265 (or 1326381938259 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21222111012112 its reverse (21121011122212), we get a palindrome (42343122134324).

The spelling of 21222111012112 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twelve thousand, one hundred twelve".