21212011221011 has 8 divisors (see below), whose sum is σ = 22959662284944. Its totient is φ = 19480925570400.

The previous prime is 21212011220987. The next prime is 21212011221019. The reversal of 21212011221011 is 11012211021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212011221011 - 2¹⁴ = 21212011204627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212011221019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4141350665 + ... + 4141355786.

It is an arithmetic number, because the mean of its divisors is an integer number (2869957785618).

Almost surely, 2^{21212011221011} is an apocalyptic number.

21212011221011 is a deficient number, since it is larger than the sum of its proper divisors (1747651063933).

21212011221011 is a wasteful number, since it uses less digits than its factorization.

21212011221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282706661.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21212011221011 its reverse (11012211021212), we get a palindrome (32224222242223).

The spelling of 21212011221011 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty-one thousand, eleven".