126858021 has 8 divisors (see below), whose sum is σ = 169197600. Its totient is φ = 84545232.

The previous prime is 126858007. The next prime is 126858031. The reversal of 126858021 is 120858621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126858021 - 2⁵ = 126857989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126858031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11151 + ... + 19443.

It is an arithmetic number, because the mean of its divisors is an integer number (21149700).

Almost surely, 2^126858021 is an apocalyptic number.

It is an amenable number.

126858021 is a deficient number, since it is larger than the sum of its proper divisors (42339579).

126858021 is an equidigital number, since it uses as much as digits as its factorization.

126858021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13395.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 126858021 is about 11263.1266085399. The cubic root of 126858021 is about 502.4651870637.

It can be divided in two parts, 12685 and 8021, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 126858021 in words is "one hundred twenty-six million, eight hundred fifty-eight thousand, twenty-one".