21021323110 has 16 divisors (see below), whose sum is σ = 39483529056. Its totient is φ = 8042940928.

The previous prime is 21021323101. The next prime is 21021323111. The reversal of 21021323110 is 1132312012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021323111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45698299 + ... + 45698758.

It is an arithmetic number, because the mean of its divisors is an integer number (2467720566).

Almost surely, 2^21021323110 is an apocalyptic number.

21021323110 is a deficient number, since it is larger than the sum of its proper divisors (18462205946).

21021323110 is a wasteful number, since it uses less digits than its factorization.

21021323110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91397087.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21021323110 its reverse (1132312012), we get a palindrome (22153635122).

The spelling of 21021323110 in words is "twenty-one billion, twenty-one million, three hundred twenty-three thousand, one hundred ten".