1260126421 has 4 divisors (see below), whose sum is σ = 1260565792. Its totient is φ = 1259687052.

The previous prime is 1260126407. The next prime is 1260126449. The reversal of 1260126421 is 1246210621.

It is a happy number.

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 1260126421 - 2⁷ = 1260126293 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 (1260126451) 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, 215355 + ... + 221128.

It is an arithmetic number, because the mean of its divisors is an integer number (315141448).

Almost surely, 2^1260126421 is an apocalyptic number.

It is an amenable number.

1260126421 is a deficient number, since it is larger than the sum of its proper divisors (439371).

1260126421 is an equidigital number, since it uses as much as digits as its factorization.

1260126421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439370.

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

The square root of 1260126421 is about 35498.2594080330. The cubic root of 1260126421 is about 1080.1184200854.

The spelling of 1260126421 in words is "one billion, two hundred sixty million, one hundred twenty-six thousand, four hundred twenty-one".