21552141242 has 4 divisors (see below), whose sum is σ = 32328211866. Its totient is φ = 10776070620.

The previous prime is 21552141239. The next prime is 21552141271. The reversal of 21552141242 is 24214125512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12789121921 + 8763019321 = 113089^2 + 93611^2 .

It is a super-5 number, since 5×21552141242⁵ (a number of 53 digits) contains 55555 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5388035309 + ... + 5388035312.

Almost surely, 2^21552141242 is an apocalyptic number.

21552141242 is a deficient number, since it is larger than the sum of its proper divisors (10776070624).

21552141242 is a wasteful number, since it uses less digits than its factorization.

21552141242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776070623.

The product of its digits is 6400, while the sum is 29.

Adding to 21552141242 its reverse (24214125512), we get a palindrome (45766266754).

The spelling of 21552141242 in words is "twenty-one billion, five hundred fifty-two million, one hundred forty-one thousand, two hundred forty-two".