21131341552 has 20 divisors (see below), whose sum is σ = 40944801240. Its totient is φ = 10564941248.

The previous prime is 21131341507. The next prime is 21131341577. The reversal of 21131341552 is 25514313112.

It is a self number, because there is not a number n which added to its sum of digits gives 21131341552.

It is a congruent number.

It is an unprimeable number.

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, 252378 + ... + 325510.

It is an arithmetic number, because the mean of its divisors is an integer number (2047240062).

Almost surely, 2^21131341552 is an apocalyptic number.

It is an amenable number.

21131341552 is a deficient number, since it is larger than the sum of its proper divisors (19813459688).

21131341552 is a wasteful number, since it uses less digits than its factorization.

21131341552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91200 (or 91194 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

Adding to 21131341552 its reverse (25514313112), we get a palindrome (46645654664).

The spelling of 21131341552 in words is "twenty-one billion, one hundred thirty-one million, three hundred forty-one thousand, five hundred fifty-two".