126126421 has 8 divisors (see below), whose sum is σ = 127524960. Its totient is φ = 124735728.

The previous prime is 126126409. The next prime is 126126431. The reversal of 126126421 is 124621621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 126126421 - 2¹¹ = 126124373 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 (126126431) 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, 33870 + ... + 37408.

It is an arithmetic number, because the mean of its divisors is an integer number (15940620).

Almost surely, 2^126126421 is an apocalyptic number.

It is an amenable number.

126126421 is a deficient number, since it is larger than the sum of its proper divisors (1398539).

126126421 is a wasteful number, since it uses less digits than its factorization.

126126421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923.

The product of its digits is 1152, while the sum is 25.

The square root of 126126421 is about 11230.6019874270. The cubic root of 126126421 is about 501.4974057421.

The spelling of 126126421 in words is "one hundred twenty-six million, one hundred twenty-six thousand, four hundred twenty-one".