211100021011 has 4 divisors (see below), whose sum is σ = 230290932024. Its totient is φ = 191909110000.

The previous prime is 211100020979. The next prime is 211100021017. The reversal of 211100021011 is 110120001112.

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 211100021011 - 2⁵ = 211100020979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211100021017) 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, 9595455490 + ... + 9595455511.

It is an arithmetic number, because the mean of its divisors is an integer number (57572733006).

Almost surely, 2^211100021011 is an apocalyptic number.

211100021011 is a deficient number, since it is larger than the sum of its proper divisors (19190911013).

211100021011 is a wasteful number, since it uses less digits than its factorization.

211100021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19190911012.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 211100021011 its reverse (110120001112), we get a palindrome (321220022123).

The spelling of 211100021011 in words is "two hundred eleven billion, one hundred million, twenty-one thousand, eleven".