21022021020011 has 4 divisors (see below), whose sum is σ = 22933113840024. Its totient is φ = 19110928200000.

The previous prime is 21022021019969. The next prime is 21022021020059. The reversal of 21022021020011 is 11002012022012.

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-21022021020011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022021020911) 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, 955546409990 + ... + 955546410011.

It is an arithmetic number, because the mean of its divisors is an integer number (5733278460006).

Almost surely, 2^{21022021020011} is an apocalyptic number.

21022021020011 is a deficient number, since it is larger than the sum of its proper divisors (1911092820013).

21022021020011 is a wasteful number, since it uses less digits than its factorization.

21022021020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911092820012.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022021020011 its reverse (11002012022012), we get a palindrome (32024033042023).

It can be divided in two parts, 2102202 and 1020011, that added together give a palindrome (3122213).

The spelling of 21022021020011 in words is "twenty-one trillion, twenty-two billion, twenty-one million, twenty thousand, eleven".