21212650725752 has 8 divisors (see below), whose sum is σ = 39773720110800. Its totient is φ = 10606325362872.

The previous prime is 21212650725743. The next prime is 21212650725781. The reversal of 21212650725752 is 25752705621212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21212650725697 and 21212650725706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325790670352 + ... + 1325790670367.

It is an arithmetic number, because the mean of its divisors is an integer number (4971715013850).

Almost surely, 2^{21212650725752} is an apocalyptic number.

It is an amenable number.

21212650725752 is a deficient number, since it is larger than the sum of its proper divisors (18561069385048).

21212650725752 is a wasteful number, since it uses less digits than its factorization.

21212650725752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651581340725 (or 2651581340721 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 21212650725752 in words is "twenty-one trillion, two hundred twelve billion, six hundred fifty million, seven hundred twenty-five thousand, seven hundred fifty-two".