13625452021 has 8 divisors (see below), whose sum is σ = 13699332504. Its totient is φ = 13551605760.

The previous prime is 13625452019. The next prime is 13625452037. The reversal of 13625452021 is 12025452631.

It can be written as a sum of positive squares in 4 ways, for example, as 3121456900 + 10503995121 = 55870^2 + 102489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13625452021 - 2¹ = 13625452019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13625452051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1439115 + ... + 1448551.

It is an arithmetic number, because the mean of its divisors is an integer number (1712416563).

Almost surely, 2^13625452021 is an apocalyptic number.

It is an amenable number.

13625452021 is a deficient number, since it is larger than the sum of its proper divisors (73880483).

13625452021 is an equidigital number, since it uses as much as digits as its factorization.

13625452021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17111.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 13625452021 in words is "thirteen billion, six hundred twenty-five million, four hundred fifty-two thousand, twenty-one".