1121020221 has 8 divisors (see below), whose sum is σ = 1498858560. Its totient is φ = 745264352.

The previous prime is 1121020213. The next prime is 1121020231. The reversal of 1121020221 is 1220201211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121020221 - 2³ = 1121020213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121020197 and 1121020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121020211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519360 + ... + 521513.

It is an arithmetic number, because the mean of its divisors is an integer number (187357320).

Almost surely, 2^1121020221 is an apocalyptic number.

It is an amenable number.

1121020221 is a deficient number, since it is larger than the sum of its proper divisors (377838339).

1121020221 is a wasteful number, since it uses less digits than its factorization.

1121020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041235.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1121020221 is about 33481.6400583962. The cubic root of 1121020221 is about 1038.8140515502.

Adding to 1121020221 its reverse (1220201211), we get a palindrome (2341221432).

The spelling of 1121020221 in words is "one billion, one hundred twenty-one million, twenty thousand, two hundred twenty-one".