21022021011 has 16 divisors (see below), whose sum is σ = 28267084800. Its totient is φ = 13896194208.

The previous prime is 21022021003. The next prime is 21022021037. The reversal of 21022021011 is 11012022012.

It is not a de Polignac number, because 21022021011 - 2³ = 21022021003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022021001) 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, 179020 + ... + 272198.

It is an arithmetic number, because the mean of its divisors is an integer number (1766692800).

Almost surely, 2^21022021011 is an apocalyptic number.

21022021011 is a deficient number, since it is larger than the sum of its proper divisors (7245063789).

21022021011 is a wasteful number, since it uses less digits than its factorization.

21022021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93818.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21022021011 its reverse (11012022012), we get a palindrome (32034043023).

The spelling of 21022021011 in words is "twenty-one billion, twenty-two million, twenty-one thousand, eleven".