21420322110 has 192 divisors, whose sum is σ = 62347574016. Its totient is φ = 5058547200.

The previous prime is 21420322057. The next prime is 21420322117. The reversal of 21420322110 is 1122302412.

It is a happy number.

21420322110 is a `hidden beast` number, since 2 + 1 + 420 + 32 + 211 + 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 (21420322117) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5996625 + ... + 6000195.

It is an arithmetic number, because the mean of its divisors is an integer number (324726948).

Almost surely, 2^21420322110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21420322110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31173787008).

21420322110 is an abundant number, since it is smaller than the sum of its proper divisors (40927251906).

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

21420322110 is a wasteful number, since it uses less digits than its factorization.

21420322110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751 (or 3748 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21420322110 its reverse (1122302412), we get a palindrome (22542624522).

The spelling of 21420322110 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-two thousand, one hundred ten".