5166021 has 24 divisors (see below), whose sum is σ = 8109504. Its totient is φ = 2916480.

The previous prime is 5166019. The next prime is 5166023. The reversal of 5166021 is 1206615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5166019) and next prime (5166023).

It is not a de Polignac number, because 5166021 - 2¹ = 5166019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5166023) 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 in 23 ways as a sum of consecutive naturals, for example, 16456 + ... + 16766.

It is an arithmetic number, because the mean of its divisors is an integer number (337896).

Almost surely, 2^5166021 is an apocalyptic number.

It is an amenable number.

5166021 is a deficient number, since it is larger than the sum of its proper divisors (2943483).

5166021 is a wasteful number, since it uses less digits than its factorization.

5166021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 5166021 is about 2272.8882506626. Note that the first 3 decimals coincide. The cubic root of 5166021 is about 172.8696379453.

It can be divided in two parts, 51660 and 21, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 5166021 in words is "five million, one hundred sixty-six thousand, twenty-one".