19950613825321 has 9 divisors (see below), whose sum is σ = 20097918143191. Its totient is φ = 19804381447792.

The previous prime is 19950613825313. The next prime is 19950613825393. The reversal of 19950613825321 is 12352831605991.

The square root of 19950613825321 is 4466611.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11719085589225 + 8231528236096 = 3423315^2 + 2869064^2 .

It is not a de Polignac number, because 19950613825321 - 2³ = 19950613825313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19950613823321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 611909406 + ... + 611942008.

Almost surely, 2^{19950613825321} is an apocalyptic number.

19950613825321 is the 4466611-st square number.

19950613825321 is the 2233306-th centered octagonal number.

It is an amenable number.

19950613825321 is a deficient number, since it is larger than the sum of its proper divisors (147304317870).

19950613825321 is an frugal number, since it uses more digits than its factorization.

19950613825321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65480 (or 32740 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 19950613825321 in words is "nineteen trillion, nine hundred fifty billion, six hundred thirteen million, eight hundred twenty-five thousand, three hundred twenty-one".