21210320011 has 16 divisors (see below), whose sum is σ = 22876910784. Its totient is φ = 19593713664.

The previous prime is 21210319997. The next prime is 21210320023. The reversal of 21210320011 is 11002301212.

It is not a de Polignac number, because 21210320011 - 2⁹ = 21210319499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210319973 and 21210320000.

It is not an unprimeable number, because it can be changed into a prime (21210320081) 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, 144265 + ... + 251461.

It is an arithmetic number, because the mean of its divisors is an integer number (1429806924).

Almost surely, 2^21210320011 is an apocalyptic number.

21210320011 is a deficient number, since it is larger than the sum of its proper divisors (1666590773).

21210320011 is a wasteful number, since it uses less digits than its factorization.

21210320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107430.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210320011 its reverse (11002301212), we get a palindrome (32212621223).

The spelling of 21210320011 in words is "twenty-one billion, two hundred ten million, three hundred twenty thousand, eleven".