21010212211212 has 144 divisors (see below), whose sum is σ = 65046893463552. Its totient is φ = 5586734229120.

The previous prime is 21010212211207. The next prime is 21010212211273. The reversal of 21010212211212 is 21211221201012.

21010212211212 is a `hidden beast` number, since 21 + 0 + 10 + 212 + 211 + 212 = 666.

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 47 ways as a sum of consecutive naturals, for example, 48771364 + ... + 49200267.

Almost surely, 2^{21010212211212} is an apocalyptic number.

It is an amenable number.

21010212211212 is an abundant number, since it is smaller than the sum of its proper divisors (44036681252340).

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

21010212211212 is a wasteful number, since it uses less digits than its factorization.

21010212211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97971708 (or 97971703 counting only the distinct ones).

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

Adding to 21010212211212 its reverse (21211221201012), we get a palindrome (42221433412224).

The spelling of 21010212211212 in words is "twenty-one trillion, ten billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".