1042540221 has 8 divisors (see below), whose sum is σ = 1391864320. Its totient is φ = 694121472.

The previous prime is 1042540217. The next prime is 1042540223. The reversal of 1042540221 is 1220452401.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1042540221 - 2² = 1042540217 is a prime.

It is a super-2 number, since 2×1042540221² = 2173780224805457682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042540223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223645 + ... + 228258.

It is an arithmetic number, because the mean of its divisors is an integer number (173983040).

Almost surely, 2^1042540221 is an apocalyptic number.

It is an amenable number.

1042540221 is a deficient number, since it is larger than the sum of its proper divisors (349324099).

1042540221 is an equidigital number, since it uses as much as digits as its factorization.

1042540221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452675.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1042540221 is about 32288.3914278801. The cubic root of 1042540221 is about 1013.9836205626.

Adding to 1042540221 its reverse (1220452401), we get a palindrome (2262992622).

The spelling of 1042540221 in words is "one billion, forty-two million, five hundred forty thousand, two hundred twenty-one".