16142521 has 2 divisors, whose sum is σ = 16142522. Its totient is φ = 16142520.

The previous prime is 16142519. The next prime is 16142543. The reversal of 16142521 is 12524161.

16142521 = T₃₂₇₉ + T₃₂₈₀ + T₃₂₈₁.

It is an a-pointer prime, because the next prime (16142543) can be obtained adding 16142521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 230400 = 3989^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 16142521 - 2¹ = 16142519 is a prime.

Together with 16142519, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 16142492 and 16142501.

It is not a weakly prime, because it can be changed into another prime (16142551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8071260 + 8071261.

It is an arithmetic number, because the mean of its divisors is an integer number (8071261).

Almost surely, 2^16142521 is an apocalyptic number.

16142521 is the 3281-st centered triangular number.

It is an amenable number.

16142521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16142521 is an equidigital number, since it uses as much as digits as its factorization.

16142521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 16142521 is about 4017.7756283795. The cubic root of 16142521 is about 252.7301877625.

Adding to 16142521 its reverse (12524161), we get a palindrome (28666682).

The spelling of 16142521 in words is "sixteen million, one hundred forty-two thousand, five hundred twenty-one".