21022020011 has 16 divisors (see below), whose sum is σ = 22011196608. Its totient is φ = 20055484800.

The previous prime is 21022020007. The next prime is 21022020073. The reversal of 21022020011 is 11002022012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21022020011 - 2² = 21022020007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022019974 and 21022020001.

It is not an unprimeable number, because it can be changed into a prime (21022020611) 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, 5373146 + ... + 5377056.

It is an arithmetic number, because the mean of its divisors is an integer number (1375699788).

Almost surely, 2^21022020011 is an apocalyptic number.

21022020011 is a deficient number, since it is larger than the sum of its proper divisors (989176597).

21022020011 is a wasteful number, since it uses less digits than its factorization.

21022020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6742.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21022020011 its reverse (11002022012), we get a palindrome (32024042023).

The spelling of 21022020011 in words is "twenty-one billion, twenty-two million, twenty thousand, eleven".