21220021011 has 8 divisors (see below), whose sum is σ = 32335270144. Its totient is φ = 12125726280.

The previous prime is 21220021003. The next prime is 21220021033. The reversal of 21220021011 is 11012002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220021011 - 2³ = 21220021003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505238575 + ... + 505238616.

It is an arithmetic number, because the mean of its divisors is an integer number (4041908768).

Almost surely, 2^21220021011 is an apocalyptic number.

21220021011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21220021011 is a deficient number, since it is larger than the sum of its proper divisors (11115249133).

21220021011 is a wasteful number, since it uses less digits than its factorization.

21220021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010477201.

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

Adding to 21220021011 its reverse (11012002212), we get a palindrome (32232023223).

The spelling of 21220021011 in words is "twenty-one billion, two hundred twenty million, twenty-one thousand, eleven".