21552172041 has 8 divisors (see below), whose sum is σ = 28999864960. Its totient is φ = 14236296912.

The previous prime is 21552172013. The next prime is 21552172043. The reversal of 21552172041 is 14027125512.

It is a happy number.

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

It is not a de Polignac number, because 21552172041 - 2¹³ = 21552163849 is a prime.

It is a super-2 number, since 2×21552172041² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552172043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32954065 + ... + 32954718.

It is an arithmetic number, because the mean of its divisors is an integer number (3624983120).

Almost surely, 2^21552172041 is an apocalyptic number.

It is an amenable number.

21552172041 is a deficient number, since it is larger than the sum of its proper divisors (7447692919).

21552172041 is a wasteful number, since it uses less digits than its factorization.

21552172041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65908895.

The product of its (nonzero) digits is 5600, while the sum is 30.

Adding to 21552172041 its reverse (14027125512), we get a palindrome (35579297553).

The spelling of 21552172041 in words is "twenty-one billion, five hundred fifty-two million, one hundred seventy-two thousand, forty-one".