827421421 has 4 divisors (see below), whose sum is σ = 827528572. Its totient is φ = 827314272.

The previous prime is 827421377. The next prime is 827421449. The reversal of 827421421 is 124124728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 342805225 + 484616196 = 18515^2 + 22014^2 .

It is a cyclic number.

It is not a de Polignac number, because 827421421 - 2¹³ = 827413229 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 (827421521) 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, 41010 + ... + 57763.

It is an arithmetic number, because the mean of its divisors is an integer number (206882143).

Almost surely, 2^827421421 is an apocalyptic number.

It is an amenable number.

827421421 is a deficient number, since it is larger than the sum of its proper divisors (107151).

827421421 is an equidigital number, since it uses as much as digits as its factorization.

827421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107150.

The product of its digits is 7168, while the sum is 31.

The square root of 827421421 is about 28764.9338779007. The cubic root of 827421421 is about 938.8054166598.

The spelling of 827421421 in words is "eight hundred twenty-seven million, four hundred twenty-one thousand, four hundred twenty-one".