423121534440 has 64 divisors (see below), whose sum is σ = 1384761389760. Its totient is φ = 102574917120.

The previous prime is 423121534403. The next prime is 423121534441. The reversal of 423121534440 is 44435121324.

It is a super-2 number, since 2×423121534440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (423121534441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160271989 + ... + 160274628.

It is an arithmetic number, because the mean of its divisors is an integer number (21636896715).

Almost surely, 2^423121534440 is an apocalyptic number.

423121534440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423121534440 is an abundant number, since it is smaller than the sum of its proper divisors (961639855320).

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

423121534440 is a wasteful number, since it uses less digits than its factorization.

423121534440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320546642 (or 320546638 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 423121534440 its reverse (44435121324), we get a palindrome (467556655764).

The spelling of 423121534440 in words is "four hundred twenty-three billion, one hundred twenty-one million, five hundred thirty-four thousand, four hundred forty".