21540033004153 has 4 divisors (see below), whose sum is σ = 22673718951760. Its totient is φ = 20406347056548.

The previous prime is 21540033004151. The next prime is 21540033004159. The reversal of 21540033004153 is 35140033004512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21540033004153 - 2¹ = 21540033004151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21540033004151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 566842973775 + ... + 566842973812.

It is an arithmetic number, because the mean of its divisors is an integer number (5668429737940).

Almost surely, 2^{21540033004153} is an apocalyptic number.

It is an amenable number.

21540033004153 is a deficient number, since it is larger than the sum of its proper divisors (1133685947607).

21540033004153 is a wasteful number, since it uses less digits than its factorization.

21540033004153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133685947606.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21540033004153 its reverse (35140033004512), we get a palindrome (56680066008665).

The spelling of 21540033004153 in words is "twenty-one trillion, five hundred forty billion, thirty-three million, four thousand, one hundred fifty-three".