21010212111222 has 12 divisors (see below), whose sum is σ = 45522126241020. Its totient is φ = 7003404037068.

The previous prime is 21010212111209. The next prime is 21010212111223. The reversal of 21010212111222 is 22211121201012.

21010212111222 is a `hidden beast` number, since 210 + 1 + 0 + 21 + 211 + 1 + 222 = 666.

It is a super-2 number, since 2×21010212111222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167234006179 = 21010212111222 / (2 + 1 + 0 + 1 + 0 + 2 + 1 + 2 + 1 + 1 + 1 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21010212111195 and 21010212111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010212111223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583617003072 + ... + 583617003107.

It is an arithmetic number, because the mean of its divisors is an integer number (3793510520085).

Almost surely, 2^{21010212111222} is an apocalyptic number.

21010212111222 is an abundant number, since it is smaller than the sum of its proper divisors (24511914129798).

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

21010212111222 is a wasteful number, since it uses less digits than its factorization.

21010212111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167234006187 (or 1167234006184 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21010212111222 its reverse (22211121201012), we get a palindrome (43221333312234).

The spelling of 21010212111222 in words is "twenty-one trillion, ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-two".