21011121202212 has 60 divisors (see below), whose sum is σ = 55544381032140. Its totient is φ = 6925013720064.

The previous prime is 21011121202157. The next prime is 21011121202271. The reversal of 21011121202212 is 21220212111012.

21011121202212 is a `hidden beast` number, since 210 + 1 + 112 + 120 + 221 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2637947678976 + 18373173523236 = 1624176^2 + 4286394^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 364292173 + ... + 364349844.

It is an arithmetic number, because the mean of its divisors is an integer number (925739683869).

Almost surely, 2^{21011121202212} is an apocalyptic number.

It is an amenable number.

21011121202212 is an abundant number, since it is smaller than the sum of its proper divisors (34533259829928).

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

21011121202212 is a wasteful number, since it uses less digits than its factorization.

21011121202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728642122 (or 728642111 counting only the distinct ones).

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

Adding to 21011121202212 its reverse (21220212111012), we get a palindrome (42231333313224).

The spelling of 21011121202212 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, two hundred two thousand, two hundred twelve".