13425520221 has 6 divisors (see below), whose sum is σ = 19392418110. Its totient is φ = 8950346808.

The previous prime is 13425520201. The next prime is 13425520223. The reversal of 13425520221 is 12202552431.

13425520221 is a `hidden beast` number, since 13 + 425 + 5 + 2 + 0 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10291088025 + 3134432196 = 101445^2 + 55986^2 .

It is not a de Polignac number, because 13425520221 - 2¹⁰ = 13425519197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13425520223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 745862226 + ... + 745862243.

It is an arithmetic number, because the mean of its divisors is an integer number (3232069685).

Almost surely, 2^13425520221 is an apocalyptic number.

It is an amenable number.

13425520221 is a deficient number, since it is larger than the sum of its proper divisors (5966897889).

13425520221 is a wasteful number, since it uses less digits than its factorization.

13425520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491724475 (or 1491724472 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 13425520221 in words is "thirteen billion, four hundred twenty-five million, five hundred twenty thousand, two hundred twenty-one".