21221030011212 has 18 divisors (see below), whose sum is σ = 53642048083988. Its totient is φ = 7073676670392.

The previous prime is 21221030011189. The next prime is 21221030011267. The reversal of 21221030011212 is 21211003012212.

21221030011212 is a `hidden beast` number, since 21 + 221 + 0 + 300 + 1 + 121 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21221030011212² (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).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294736527898 + ... + 294736527969.

Almost surely, 2^{21221030011212} is an apocalyptic number.

It is an amenable number.

21221030011212 is an abundant number, since it is smaller than the sum of its proper divisors (32421018072776).

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

21221030011212 is a wasteful number, since it uses less digits than its factorization.

21221030011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589473055877 (or 589473055872 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221030011212 its reverse (21211003012212), we get a palindrome (42432033023424).

The spelling of 21221030011212 in words is "twenty-one trillion, two hundred twenty-one billion, thirty million, eleven thousand, two hundred twelve".