1000221236 has 12 divisors (see below), whose sum is σ = 2000442528. Its totient is φ = 428666232.

The previous prime is 1000221221. The next prime is 1000221251. The reversal of 1000221236 is 6321220001.

It is an interprime number because it is at equal distance from previous prime (1000221221) and next prime (1000221251).

1000221236 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17861066 + ... + 17861121.

It is an arithmetic number, because the mean of its divisors is an integer number (166703544).

Almost surely, 2^1000221236 is an apocalyptic number.

It is an amenable number.

1000221236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000221236 is a wasteful number, since it uses less digits than its factorization.

1000221236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35722198 (or 35722196 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1000221236 is about 31626.2744565338. The cubic root of 1000221236 is about 1000.0737398956.

Adding to 1000221236 its reverse (6321220001), we get a palindrome (7321441237).

The spelling of 1000221236 in words is "one billion, two hundred twenty-one thousand, two hundred thirty-six".