126010517021 has 4 divisors (see below), whose sum is σ = 126065762844. Its totient is φ = 125955271200.

The previous prime is 126010517011. The next prime is 126010517027. The reversal of 126010517021 is 120715010621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120715010621 = 1753 ⋅68861957.

It can be written as a sum of positive squares in 2 ways, for example, as 89754168100 + 36256348921 = 299590^2 + 190411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126010517021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126010517027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27619490 + ... + 27624051.

It is an arithmetic number, because the mean of its divisors is an integer number (31516440711).

Almost surely, 2^126010517021 is an apocalyptic number.

It is an amenable number.

126010517021 is a deficient number, since it is larger than the sum of its proper divisors (55245823).

126010517021 is an equidigital number, since it uses as much as digits as its factorization.

126010517021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55245822.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 126010517021 its reverse (120715010621), we get a palindrome (246725527642).

The spelling of 126010517021 in words is "one hundred twenty-six billion, ten million, five hundred seventeen thousand, twenty-one".