21000140324 has 24 divisors (see below), whose sum is σ = 39313191960. Its totient is φ = 9780535296.

The previous prime is 21000140323. The next prime is 21000140333. The reversal of 21000140324 is 42304100012.

It can be written as a sum of positive squares in 4 ways, for example, as 4214346724 + 16785793600 = 64918^2 + 129560^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (21000140321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1585289 + ... + 1598480.

It is an arithmetic number, because the mean of its divisors is an integer number (1638049665).

Almost surely, 2^21000140324 is an apocalyptic number.

It is an amenable number.

21000140324 is a deficient number, since it is larger than the sum of its proper divisors (18313051636).

21000140324 is a wasteful number, since it uses less digits than its factorization.

21000140324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183887 (or 3183885 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21000140324 its reverse (42304100012), we get a palindrome (63304240336).

The spelling of 21000140324 in words is "twenty-one billion, one hundred forty thousand, three hundred twenty-four".