21153132004 has 6 divisors (see below), whose sum is σ = 37017981014. Its totient is φ = 10576566000.

The previous prime is 21153131971. The next prime is 21153132019. The reversal of 21153132004 is 40023135112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20093629504 + 1059502500 = 141752^2 + 32550^2 .

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 as a sum of consecutive naturals, namely, 2644141497 + ... + 2644141504.

Almost surely, 2^21153132004 is an apocalyptic number.

It is an amenable number.

21153132004 is a deficient number, since it is larger than the sum of its proper divisors (15864849010).

21153132004 is a wasteful number, since it uses less digits than its factorization.

21153132004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288283005 (or 5288283003 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21153132004 its reverse (40023135112), we get a palindrome (61176267116).

The spelling of 21153132004 in words is "twenty-one billion, one hundred fifty-three million, one hundred thirty-two thousand, four".