1121000221 has 4 divisors (see below), whose sum is σ = 1222909344. Its totient is φ = 1019091100.

The previous prime is 1121000219. The next prime is 1121000263. The reversal of 1121000221 is 1220001211.

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 1121000221 - 2¹ = 1121000219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121000198 and 1121000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121009221) 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, 50954545 + ... + 50954566.

It is an arithmetic number, because the mean of its divisors is an integer number (305727336).

Almost surely, 2^1121000221 is an apocalyptic number.

1121000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121000221 is a deficient number, since it is larger than the sum of its proper divisors (101909123).

1121000221 is a wasteful number, since it uses less digits than its factorization.

1121000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101909122.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1121000221 is about 33481.3413859122. The cubic root of 1121000221 is about 1038.8078737239.

Adding to 1121000221 its reverse (1220001211), we get a palindrome (2341001432).

The spelling of 1121000221 in words is "one billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.