21221440110 has 96 divisors (see below), whose sum is σ = 59447999520. Its totient is φ = 5221281024.

The previous prime is 21221440091. The next prime is 21221440117. The reversal of 21221440110 is 1104412212.

21221440110 is a `hidden beast` number, since 2 + 1 + 221 + 440 + 1 + 1 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221440117) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4664857 + ... + 4669403.

It is an arithmetic number, because the mean of its divisors is an integer number (619249995).

Almost surely, 2^21221440110 is an apocalyptic number.

21221440110 is an abundant number, since it is smaller than the sum of its proper divisors (38226559410).

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

21221440110 is a wasteful number, since it uses less digits than its factorization.

21221440110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8562 (or 8559 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221440110 its reverse (1104412212), we get a palindrome (22325852322).

The spelling of 21221440110 in words is "twenty-one billion, two hundred twenty-one million, four hundred forty thousand, one hundred ten".