21032401340 has 12 divisors (see below), whose sum is σ = 44168042856. Its totient is φ = 8412960528.

The previous prime is 21032401339. The next prime is 21032401349. The reversal of 21032401340 is 4310423012.

It is a super-2 number, since 2×21032401340² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1051620067 = 21032401340 / (2 + 1 + 0 + 3 + 2 + 4 + 0 + 1 + 3 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032401349) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 525810014 + ... + 525810053.

It is an arithmetic number, because the mean of its divisors is an integer number (3680670238).

Almost surely, 2^21032401340 is an apocalyptic number.

21032401340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032401340 is an abundant number, since it is smaller than the sum of its proper divisors (23135641516).

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

21032401340 is a wasteful number, since it uses less digits than its factorization.

21032401340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051620076 (or 1051620074 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21032401340 its reverse (4310423012), we get a palindrome (25342824352).

The spelling of 21032401340 in words is "twenty-one billion, thirty-two million, four hundred one thousand, three hundred forty".