126021 has 16 divisors (see below), whose sum is σ = 203904. Its totient is φ = 67584.

The previous prime is 126019. The next prime is 126023. The reversal of 126021 is 120621.

It is an interprime number because it is at equal distance from previous prime (126019) and next prime (126023).

It is not a de Polignac number, because 126021 - 2¹ = 126019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125988 and 126006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181 + ... + 533.

It is an arithmetic number, because the mean of its divisors is an integer number (12744).

2¹²⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

126021 is a deficient number, since it is larger than the sum of its proper divisors (77883).

126021 is a wasteful number, since it uses less digits than its factorization.

126021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 126021 is about 354.9943661525. The cubic root of 126021 is about 50.1357643604.

Adding to 126021 its reverse (120621), we get a palindrome (246642).

The spelling of 126021 in words is "one hundred twenty-six thousand, twenty-one".