1009312221 has 16 divisors (see below), whose sum is σ = 1362562880. Its totient is φ = 664519680.

The previous prime is 1009312193. The next prime is 1009312301. The reversal of 1009312221 is 1222139001.

It is not a de Polignac number, because 1009312221 - 2⁵ = 1009312189 is a prime.

It is a super-2 number, since 2×1009312221² = 2037422318919905682, 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 (1009312021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74211 + ... + 86751.

It is an arithmetic number, because the mean of its divisors is an integer number (85160180).

Almost surely, 2^1009312221 is an apocalyptic number.

It is an amenable number.

1009312221 is a deficient number, since it is larger than the sum of its proper divisors (353250659).

1009312221 is a wasteful number, since it uses less digits than its factorization.

1009312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12876.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1009312221 is about 31769.6745497967. The cubic root of 1009312221 is about 1003.0944879336.

The spelling of 1009312221 in words is "one billion, nine million, three hundred twelve thousand, two hundred twenty-one".