21431103140 has 48 divisors (see below), whose sum is σ = 45853622640. Its totient is φ = 8412364800.

The previous prime is 21431103101. The next prime is 21431103163. The reversal of 21431103140 is 4130113412.

It can be written as a sum of positive squares in 8 ways, for example, as 4181432896 + 17249670244 = 64664^2 + 131338^2 .

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

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 15 ways as a sum of consecutive naturals, for example, 181316 + ... + 275204.

It is an arithmetic number, because the mean of its divisors is an integer number (955283805).

Almost surely, 2^21431103140 is an apocalyptic number.

21431103140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431103140 is an abundant number, since it is smaller than the sum of its proper divisors (24422519500).

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

21431103140 is a wasteful number, since it uses less digits than its factorization.

21431103140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94112 (or 94110 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21431103140 its reverse (4130113412), we get a palindrome (25561216552).

The spelling of 21431103140 in words is "twenty-one billion, four hundred thirty-one million, one hundred three thousand, one hundred forty".