126772421 has 4 divisors (see below), whose sum is σ = 127172652. Its totient is φ = 126372192.

The previous prime is 126772411. The next prime is 126772433. The reversal of 126772421 is 124277621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124277621 = 13 ⋅9559817.

It can be written as a sum of positive squares in 2 ways, for example, as 22221796 + 104550625 = 4714^2 + 10225^2 .

It is a cyclic number.

It is not a de Polignac number, because 126772421 - 2⁶ = 126772357 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 (126772411) 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, 199640 + ... + 200273.

It is an arithmetic number, because the mean of its divisors is an integer number (31793163).

Almost surely, 2^126772421 is an apocalyptic number.

It is an amenable number.

126772421 is a deficient number, since it is larger than the sum of its proper divisors (400231).

126772421 is an equidigital number, since it uses as much as digits as its factorization.

126772421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400230.

The product of its digits is 9408, while the sum is 32.

The square root of 126772421 is about 11259.3259567347. The cubic root of 126772421 is about 502.3521454721.

The spelling of 126772421 in words is "one hundred twenty-six million, seven hundred seventy-two thousand, four hundred twenty-one".