13542021 has 6 divisors (see below), whose sum is σ = 19560710. Its totient is φ = 9028008.

The previous prime is 13541993. The next prime is 13542029. The reversal of 13542021 is 12024531.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 1368900 = 3489^2 + 1170^2 .

It is not a de Polignac number, because 13542021 - 2⁷ = 13541893 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 13541985 and 13542003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13542029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 752326 + ... + 752343.

Almost surely, 2^13542021 is an apocalyptic number.

It is an amenable number.

13542021 is a deficient number, since it is larger than the sum of its proper divisors (6018689).

13542021 is a wasteful number, since it uses less digits than its factorization.

13542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504675 (or 1504672 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13542021 is about 3679.9485050745. The cubic root of 13542021 is about 238.3569544239.

Adding to 13542021 its reverse (12024531), we get a palindrome (25566552).

It can be divided in two parts, 1354 and 2021, that added together give a cube (3375 = 15³).

The spelling of 13542021 in words is "thirteen million, five hundred forty-two thousand, twenty-one".