21120222012112 has 10 divisors (see below), whose sum is σ = 40920430148498. Its totient is φ = 10560111006048.

The previous prime is 21120222012107. The next prime is 21120222012119. The reversal of 21120222012112 is 21121022202112.

It can be written as a sum of positive squares in only one way, i.e., 20663170296976 + 457051715136 = 4545676^2 + 676056^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21120222012112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222012119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660006937863 + ... + 660006937894.

Almost surely, 2^{21120222012112} is an apocalyptic number.

It is an amenable number.

21120222012112 is a deficient number, since it is larger than the sum of its proper divisors (19800208136386).

21120222012112 is a wasteful number, since it uses less digits than its factorization.

21120222012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320013875765 (or 1320013875759 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21120222012112 its reverse (21121022202112), we get a palindrome (42241244214224).

The spelling of 21120222012112 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, twelve thousand, one hundred twelve".