21212102001011 has 4 divisors (see below), whose sum is σ = 21232636466712. Its totient is φ = 21191567535312.

The previous prime is 21212102000987. The next prime is 21212102001017. The reversal of 21212102001011 is 11010020121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212102001011 - 2¹⁴ = 21212101984627 is a prime.

It is a super-3 number, since 3×21212102001011³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212102001017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10267231301 + ... + 10267233366.

It is an arithmetic number, because the mean of its divisors is an integer number (5308159116678).

Almost surely, 2^{21212102001011} is an apocalyptic number.

21212102001011 is a deficient number, since it is larger than the sum of its proper divisors (20534465701).

21212102001011 is a wasteful number, since it uses less digits than its factorization.

21212102001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20534465700.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212102001011 its reverse (11010020121212), we get a palindrome (32222122122223).

The spelling of 21212102001011 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, one thousand, eleven".