21200011011 has 20 divisors (see below), whose sum is σ = 31676710032. Its totient is φ = 14129967888.

The previous prime is 21200010991. The next prime is 21200011043. The reversal of 21200011011 is 11011000212.

It is a happy number.

It is not a de Polignac number, because 21200011011 - 2⁷ = 21200010883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21200010984 and 21200011002.

It is not an unprimeable number, because it can be changed into a prime (21200011711) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 336906 + ... + 394848.

Almost surely, 2^21200011011 is an apocalyptic number.

21200011011 is a deficient number, since it is larger than the sum of its proper divisors (10476699021).

21200011011 is an equidigital number, since it uses as much as digits as its factorization.

21200011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62472 (or 62463 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21200011011 its reverse (11011000212), we get a palindrome (32211011223).

The spelling of 21200011011 in words is "twenty-one billion, two hundred million, eleven thousand, eleven".