21552002221005 has 48 divisors (see below), whose sum is σ = 37601597779200. Its totient is φ = 11419157274624.

The previous prime is 21552002221003. The next prime is 21552002221039. The reversal of 21552002221005 is 50012220025512.

It is a happy number.

21552002221005 is a `hidden beast` number, since 2 + 1 + 552 + 0 + 0 + 2 + 2 + 2 + 100 + 5 = 666.

It is not a de Polignac number, because 21552002221005 - 2¹ = 21552002221003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552002221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552002221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12595021 + ... + 14203469.

It is an arithmetic number, because the mean of its divisors is an integer number (783366620400).

Almost surely, 2^{21552002221005} is an apocalyptic number.

It is an amenable number.

21552002221005 is a deficient number, since it is larger than the sum of its proper divisors (16049595558195).

21552002221005 is a wasteful number, since it uses less digits than its factorization.

21552002221005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610410 (or 1610407 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 21552002221005 its reverse (50012220025512), we get a palindrome (71564222246517).

The spelling of 21552002221005 in words is "twenty-one trillion, five hundred fifty-two billion, two million, two hundred twenty-one thousand, five".