21212034021211 has 12 divisors (see below), whose sum is σ = 23436513613576. Its totient is φ = 19183751896320.

The previous prime is 21212034021197. The next prime is 21212034021221. The reversal of 21212034021211 is 11212043021212.

It is not a de Polignac number, because 21212034021211 - 2⁵ = 21212034021179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212034021221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454137441 + ... + 454184146.

Almost surely, 2^{21212034021211} is an apocalyptic number.

21212034021211 is a deficient number, since it is larger than the sum of its proper divisors (2224479592365).

21212034021211 is a wasteful number, since it uses less digits than its factorization.

21212034021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908321802 (or 908321791 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21212034021211 its reverse (11212043021212), we get a palindrome (32424077042423).

Subtracting from 21212034021211 its reverse (11212043021212), we obtain a palindrome (9999990999999).

The spelling of 21212034021211 in words is "twenty-one trillion, two hundred twelve billion, thirty-four million, twenty-one thousand, two hundred eleven".