126073021 has 2 divisors, whose sum is σ = 126073022. Its totient is φ = 126073020.

The previous prime is 126073009. The next prime is 126073043. The reversal of 126073021 is 120370621.

It is an a-pointer prime, because the next prime (126073043) can be obtained adding 126073021 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., 125753796 + 319225 = 11214^2 + 565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126073021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126072983 and 126073001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126073091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63036510 + 63036511.

It is an arithmetic number, because the mean of its divisors is an integer number (63036511).

Almost surely, 2^126073021 is an apocalyptic number.

It is an amenable number.

126073021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126073021 is an equidigital number, since it uses as much as digits as its factorization.

126073021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 126073021 is about 11228.2243030677. The cubic root of 126073021 is about 501.4266203043.

The spelling of 126073021 in words is "one hundred twenty-six million, seventy-three thousand, twenty-one".