21147357052 has 12 divisors (see below), whose sum is σ = 37151876160. Its totient is φ = 10532535296.

The previous prime is 21147357041. The next prime is 21147357053. The reversal of 21147357052 is 25075374112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147357053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10284652 + ... + 10286707.

It is an arithmetic number, because the mean of its divisors is an integer number (3095989680).

Almost surely, 2^21147357052 is an apocalyptic number.

It is an amenable number.

21147357052 is a deficient number, since it is larger than the sum of its proper divisors (16004519108).

21147357052 is a wasteful number, since it uses less digits than its factorization.

21147357052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20571620 (or 20571618 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 21147357052 in words is "twenty-one billion, one hundred forty-seven million, three hundred fifty-seven thousand, fifty-two".