21146004554 has 8 divisors (see below), whose sum is σ = 32317478820. Its totient is φ = 10373511616.

The previous prime is 21146004553. The next prime is 21146004587. The reversal of 21146004554 is 45540064112.

It can be written as a sum of positive squares in 2 ways, for example, as 19817037529 + 1328967025 = 140773^2 + 36455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21146004554.

It is not an unprimeable number, because it can be changed into a prime (21146004553) 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 3 ways as a sum of consecutive naturals, for example, 99745199 + ... + 99745410.

Almost surely, 2^21146004554 is an apocalyptic number.

21146004554 is a deficient number, since it is larger than the sum of its proper divisors (11171474266).

21146004554 is a wasteful number, since it uses less digits than its factorization.

21146004554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199490664.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21146004554 its reverse (45540064112), we get a palindrome (66686068666).

The spelling of 21146004554 in words is "twenty-one billion, one hundred forty-six million, four thousand, five hundred fifty-four".