21375240555772 has 12 divisors (see below), whose sum is σ = 39607063382880. Its totient is φ = 10058936732096.

The previous prime is 21375240555719. The next prime is 21375240555791. The reversal of 21375240555772 is 27755504257312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157170886372 + ... + 157170886507.

It is an arithmetic number, because the mean of its divisors is an integer number (3300588615240).

Almost surely, 2^{21375240555772} is an apocalyptic number.

It is an amenable number.

21375240555772 is a deficient number, since it is larger than the sum of its proper divisors (18231822827108).

21375240555772 is a wasteful number, since it uses less digits than its factorization.

21375240555772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314341772900 (or 314341772898 counting only the distinct ones).

The product of its (nonzero) digits is 20580000, while the sum is 55.

The spelling of 21375240555772 in words is "twenty-one trillion, three hundred seventy-five billion, two hundred forty million, five hundred fifty-five thousand, seven hundred seventy-two".