21154304502 has 24 divisors (see below), whose sum is σ = 46141945200. Its totient is φ = 7004108880.

The previous prime is 21154304471. The next prime is 21154304543. The reversal of 21154304502 is 20540345112.

21154304502 is a `hidden beast` number, since 2 + 1 + 154 + 3 + 0 + 4 + 502 = 666.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 3941074 + ... + 3946437.

It is an arithmetic number, because the mean of its divisors is an integer number (1922581050).

Almost surely, 2^21154304502 is an apocalyptic number.

21154304502 is an abundant number, since it is smaller than the sum of its proper divisors (24987640698).

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

21154304502 is a wasteful number, since it uses less digits than its factorization.

21154304502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887668 (or 7887665 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21154304502 its reverse (20540345112), we get a palindrome (41694649614).

The spelling of 21154304502 in words is "twenty-one billion, one hundred fifty-four million, three hundred four thousand, five hundred two".