21212011001212 has 6 divisors (see below), whose sum is σ = 37121019252128. Its totient is φ = 10606005500604.

The previous prime is 21212011001201. The next prime is 21212011001213. The reversal of 21212011001212 is 21210011021212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011001213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651501375148 + ... + 2651501375155.

Almost surely, 2^{21212011001212} is an apocalyptic number.

It is an amenable number.

21212011001212 is a deficient number, since it is larger than the sum of its proper divisors (15909008250916).

21212011001212 is a wasteful number, since it uses less digits than its factorization.

21212011001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303002750307 (or 5303002750305 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212011001212 its reverse (21210011021212), we get a palindrome (42422022022424).

The spelling of 21212011001212 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one thousand, two hundred twelve".