842221457 has 24 divisors (see below), whose sum is σ = 1076068800. Its totient is φ = 651809760.

The previous prime is 842221453. The next prime is 842221459. The reversal of 842221457 is 754122248.

It is not a de Polignac number, because 842221457 - 2² = 842221453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842221453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75068 + ... + 85554.

It is an arithmetic number, because the mean of its divisors is an integer number (44836200).

Almost surely, 2^842221457 is an apocalyptic number.

It is an amenable number.

842221457 is a deficient number, since it is larger than the sum of its proper divisors (233847343).

842221457 is a wasteful number, since it uses less digits than its factorization.

842221457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661 (or 10654 counting only the distinct ones).

The product of its digits is 35840, while the sum is 35.

The square root of 842221457 is about 29021.0519623256. The cubic root of 842221457 is about 944.3698221974.

The spelling of 842221457 in words is "eight hundred forty-two million, two hundred twenty-one thousand, four hundred fifty-seven".