21010313011 has 4 divisors (see below), whose sum is σ = 21298125592. Its totient is φ = 20722500432.

The previous prime is 21010312969. The next prime is 21010313017. The reversal of 21010313011 is 11031301012.

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 21010313011 - 2²¹ = 21008215859 is a prime.

It is a super-2 number, since 2×21010313011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010312982 and 21010313000.

It is not an unprimeable number, because it can be changed into a prime (21010313017) 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, 143906181 + ... + 143906326.

It is an arithmetic number, because the mean of its divisors is an integer number (5324531398).

Almost surely, 2^21010313011 is an apocalyptic number.

21010313011 is a deficient number, since it is larger than the sum of its proper divisors (287812581).

21010313011 is an equidigital number, since it uses as much as digits as its factorization.

21010313011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287812580.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21010313011 its reverse (11031301012), we get a palindrome (32041614023).

The spelling of 21010313011 in words is "twenty-one billion, ten million, three hundred thirteen thousand, eleven".