212420100440 has 16 divisors (see below), whose sum is σ = 477945226080. Its totient is φ = 84968040160.

The previous prime is 212420100433. The next prime is 212420100461. The reversal of 212420100440 is 44001024212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2655251216 + ... + 2655251295.

It is an arithmetic number, because the mean of its divisors is an integer number (29871576630).

Almost surely, 2^212420100440 is an apocalyptic number.

212420100440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212420100440 is an abundant number, since it is smaller than the sum of its proper divisors (265525125640).

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

212420100440 is a wasteful number, since it uses less digits than its factorization.

212420100440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310502522 (or 5310502518 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 212420100440 its reverse (44001024212), we get a palindrome (256421124652).

The spelling of 212420100440 in words is "two hundred twelve billion, four hundred twenty million, one hundred thousand, four hundred forty".