21000140524 has 24 divisors (see below), whose sum is σ = 41834274048. Its totient is φ = 9130495440.

The previous prime is 21000140521. The next prime is 21000140543. The reversal of 21000140524 is 42504100012.

It is not an unprimeable number, because it can be changed into a prime (21000140521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10374552 + ... + 10376575.

It is an arithmetic number, because the mean of its divisors is an integer number (1743094752).

Almost surely, 2^21000140524 is an apocalyptic number.

It is an amenable number.

21000140524 is a deficient number, since it is larger than the sum of its proper divisors (20834133524).

21000140524 is a wasteful number, since it uses less digits than its factorization.

21000140524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20751165 (or 20751163 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21000140524 its reverse (42504100012), we get a palindrome (63504240536).

The spelling of 21000140524 in words is "twenty-one billion, one hundred forty thousand, five hundred twenty-four".