20111021021211 has 8 divisors (see below), whose sum is σ = 26856527294544. Its totient is φ = 13386431047680.

The previous prime is 20111021021177. The next prime is 20111021021243. The reversal of 20111021021211 is 11212012011102.

It is a happy number.

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

It is not a de Polignac number, because 20111021021211 - 2¹³ = 20111021013019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111028021211) 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, 5229072706 + ... + 5229076551.

It is an arithmetic number, because the mean of its divisors is an integer number (3357065911818).

Almost surely, 2^{20111021021211} is an apocalyptic number.

20111021021211 is a deficient number, since it is larger than the sum of its proper divisors (6745506273333).

20111021021211 is a wasteful number, since it uses less digits than its factorization.

20111021021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10458149901.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111021021211 its reverse (11212012011102), we get a palindrome (31323033032313).

The spelling of 20111021021211 in words is "twenty trillion, one hundred eleven billion, twenty-one million, twenty-one thousand, two hundred eleven".