21020122112011 has 32 divisors (see below), whose sum is σ = 23732113116096. Its totient is φ = 18451380480000.

The previous prime is 21020122111973. The next prime is 21020122112053. The reversal of 21020122112011 is 11021122102012.

It is a cyclic number.

It is not a de Polignac number, because 21020122112011 - 2³¹ = 21017974628363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020122112711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119118801 + ... + 119295133.

It is an arithmetic number, because the mean of its divisors is an integer number (741628534878).

Almost surely, 2^{21020122112011} is an apocalyptic number.

21020122112011 is a deficient number, since it is larger than the sum of its proper divisors (2711991004085).

21020122112011 is a wasteful number, since it uses less digits than its factorization.

21020122112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179103.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020122112011 its reverse (11021122102012), we get a palindrome (32041244214023).

Subtracting from 21020122112011 its reverse (11021122102012), we obtain a palindrome (9999000009999).

The spelling of 21020122112011 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, one hundred twelve thousand, eleven".