21040002452 has 24 divisors (see below), whose sum is σ = 42088530624. Its totient is φ = 9015316992.

The previous prime is 21040002443. The next prime is 21040002463. The reversal of 21040002452 is 25420004012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 69428 + ... + 216564.

It is an arithmetic number, because the mean of its divisors is an integer number (1753688776).

Almost surely, 2^21040002452 is an apocalyptic number.

It is an amenable number.

21040002452 is an abundant number, since it is smaller than the sum of its proper divisors (21048528172).

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

21040002452 is a wasteful number, since it uses less digits than its factorization.

21040002452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152255 (or 152253 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21040002452 its reverse (25420004012), we get a palindrome (46460006464).

The spelling of 21040002452 in words is "twenty-one billion, forty million, two thousand, four hundred fifty-two".