21320001011 has 4 divisors (see below), whose sum is σ = 21815815032. Its totient is φ = 20824186992.

The previous prime is 21320000983. The next prime is 21320001067. The reversal of 21320001011 is 11010002312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21320001011 - 2¹⁴ = 21319984627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320000983 and 21320001001.

It is not an unprimeable number, because it can be changed into a prime (21320001511) 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, 247906946 + ... + 247907031.

It is an arithmetic number, because the mean of its divisors is an integer number (5453953758).

Almost surely, 2^21320001011 is an apocalyptic number.

21320001011 is a deficient number, since it is larger than the sum of its proper divisors (495814021).

21320001011 is an equidigital number, since it uses as much as digits as its factorization.

21320001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495814020.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21320001011 its reverse (11010002312), we get a palindrome (32330003323).

The spelling of 21320001011 in words is "twenty-one billion, three hundred twenty million, one thousand, eleven".