21120211102011 has 16 divisors (see below), whose sum is σ = 32200832845824. Its totient is φ = 12062071799424.

The previous prime is 21120211101971. The next prime is 21120211102049. The reversal of 21120211102011 is 11020111202112.

It is a happy number.

It is not a de Polignac number, because 21120211102011 - 2⁶ = 21120211101947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120211102811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275804926 + ... + 275881491.

It is an arithmetic number, because the mean of its divisors is an integer number (2012552052864).

Almost surely, 2^{21120211102011} is an apocalyptic number.

21120211102011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21120211102011 is a deficient number, since it is larger than the sum of its proper divisors (11080621743813).

21120211102011 is a wasteful number, since it uses less digits than its factorization.

21120211102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551688250.

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

Adding to 21120211102011 its reverse (11020111202112), we get a palindrome (32140322304123).

The spelling of 21120211102011 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, one hundred two thousand, eleven".