21012022011011 has 4 divisors (see below), whose sum is σ = 21140930121672. Its totient is φ = 20883113900352.

The previous prime is 21012022010977. The next prime is 21012022011103. The reversal of 21012022011011 is 11011022021012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012022011011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012022019011) 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, 64454055086 + ... + 64454055411.

It is an arithmetic number, because the mean of its divisors is an integer number (5285232530418).

Almost surely, 2^{21012022011011} is an apocalyptic number.

21012022011011 is a deficient number, since it is larger than the sum of its proper divisors (128908110661).

21012022011011 is a wasteful number, since it uses less digits than its factorization.

21012022011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128908110660.

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

Adding to 21012022011011 its reverse (11011022021012), we get a palindrome (32023044032023).

The spelling of 21012022011011 in words is "twenty-one trillion, twelve billion, twenty-two million, eleven thousand, eleven".