21541320532 has 6 divisors (see below), whose sum is σ = 37697310938. Its totient is φ = 10770660264.

The previous prime is 21541320523. The next prime is 21541320533. The reversal of 21541320532 is 23502314512.

It can be written as a sum of positive squares in only one way, i.e., 17648059716 + 3893260816 = 132846^2 + 62396^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21541320532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541320533) 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 as a sum of consecutive naturals, namely, 2692665063 + ... + 2692665070.

Almost surely, 2^21541320532 is an apocalyptic number.

It is an amenable number.

21541320532 is a deficient number, since it is larger than the sum of its proper divisors (16155990406).

21541320532 is a wasteful number, since it uses less digits than its factorization.

21541320532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385330137 (or 5385330135 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21541320532 in words is "twenty-one billion, five hundred forty-one million, three hundred twenty thousand, five hundred thirty-two".