81214420710 has 128 divisors (see below), whose sum is σ = 205491686400. Its totient is φ = 20502310400.

The previous prime is 81214420633. The next prime is 81214420741. The reversal of 81214420710 is 1702441218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 41668816 + ... + 41670764.

It is an arithmetic number, because the mean of its divisors is an integer number (1605403800).

Almost surely, 2^81214420710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81214420710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102745843200).

81214420710 is an abundant number, since it is smaller than the sum of its proper divisors (124277265690).

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

81214420710 is a wasteful number, since it uses less digits than its factorization.

81214420710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574.

The product of its (nonzero) digits is 3584, while the sum is 30.

Adding to 81214420710 its reverse (1702441218), we get a palindrome (82916861928).

The spelling of 81214420710 in words is "eighty-one billion, two hundred fourteen million, four hundred twenty thousand, seven hundred ten".