13620521 has 2 divisors, whose sum is σ = 13620522. Its totient is φ = 13620520.

The previous prime is 13620493. The next prime is 13620527. The reversal of 13620521 is 12502631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 739600 = 3589^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 13620521 - 2⁶ = 13620457 is a prime.

It is a super-2 number, since 2×13620521² = 371037184622882, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 13620493 and 13620502.

It is not a weakly prime, because it can be changed into another prime (13620527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810260 + 6810261.

It is an arithmetic number, because the mean of its divisors is an integer number (6810261).

Almost surely, 2^13620521 is an apocalyptic number.

It is an amenable number.

13620521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13620521 is an equidigital number, since it uses as much as digits as its factorization.

13620521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13620521 is about 3690.5990028720. The cubic root of 13620521 is about 238.8166342704.

It can be divided in two parts, 13620 and 521, that added together give a palindrome (14141).

The spelling of 13620521 in words is "thirteen million, six hundred twenty thousand, five hundred twenty-one".