21320332110 has 128 divisors (see below), whose sum is σ = 70883251200. Its totient is φ = 4430194560.

The previous prime is 21320332091. The next prime is 21320332129. The reversal of 21320332110 is 1123302312.

21320332110 is a `hidden beast` number, since 2 + 1 + 320 + 332 + 1 + 10 = 666.

It is an interprime number because it is at equal distance from previous prime (21320332091) and next prime (21320332129).

It is a super-2 number, since 2×21320332110² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 491965 + ... + 533544.

It is an arithmetic number, because the mean of its divisors is an integer number (553775400).

Almost surely, 2^21320332110 is an apocalyptic number.

21320332110 is an abundant number, since it is smaller than the sum of its proper divisors (49562919090).

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

21320332110 is a wasteful number, since it uses less digits than its factorization.

21320332110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025543 (or 1025537 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21320332110 its reverse (1123302312), we get a palindrome (22443634422).

The spelling of 21320332110 in words is "twenty-one billion, three hundred twenty million, three hundred thirty-two thousand, one hundred ten".