21011323110 has 32 divisors (see below), whose sum is σ = 50438810592. Its totient is φ = 5601726720.

The previous prime is 21011323007. The next prime is 21011323117. The reversal of 21011323110 is 1132311012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21011323110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011323117) 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 15 ways as a sum of consecutive naturals, for example, 55140 + ... + 212280.

It is an arithmetic number, because the mean of its divisors is an integer number (1576212831).

Almost surely, 2^21011323110 is an apocalyptic number.

21011323110 is an abundant number, since it is smaller than the sum of its proper divisors (29427487482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011323110 is a wasteful number, since it uses less digits than its factorization.

21011323110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161608.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21011323110 its reverse (1132311012), we get a palindrome (22143634122).

The spelling of 21011323110 in words is "twenty-one billion, eleven million, three hundred twenty-three thousand, one hundred ten".