842529221 has 4 divisors (see below), whose sum is σ = 855104352. Its totient is φ = 829954092.

The previous prime is 842529161. The next prime is 842529227. The reversal of 842529221 is 122925248.

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 842529221 - 2¹⁴ = 842512837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842529227) 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, 6287465 + ... + 6287598.

It is an arithmetic number, because the mean of its divisors is an integer number (213776088).

Almost surely, 2^842529221 is an apocalyptic number.

It is an amenable number.

842529221 is a deficient number, since it is larger than the sum of its proper divisors (12575131).

842529221 is a wasteful number, since it uses less digits than its factorization.

842529221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12575130.

The product of its digits is 23040, while the sum is 35.

The square root of 842529221 is about 29026.3539046846. The cubic root of 842529221 is about 944.4848385179.

The spelling of 842529221 in words is "eight hundred forty-two million, five hundred twenty-nine thousand, two hundred twenty-one".