126124021 has 4 divisors (see below), whose sum is σ = 126897952. Its totient is φ = 125350092.

The previous prime is 126124007. The next prime is 126124039. The reversal of 126124021 is 120421621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126124021 - 2⁵ = 126123989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126124021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126124051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386721 + ... + 387046.

It is an arithmetic number, because the mean of its divisors is an integer number (31724488).

Almost surely, 2^126124021 is an apocalyptic number.

It is an amenable number.

126124021 is a deficient number, since it is larger than the sum of its proper divisors (773931).

126124021 is an equidigital number, since it uses as much as digits as its factorization.

126124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773930.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 126124021 is about 11230.4951360125. The cubic root of 126124021 is about 501.4942248029.

Adding to 126124021 its reverse (120421621), we get a palindrome (246545642).

The spelling of 126124021 in words is "one hundred twenty-six million, one hundred twenty-four thousand, twenty-one".