1020121221 has 8 divisors (see below), whose sum is σ = 1554470464. Its totient is φ = 582926400.

The previous prime is 1020121213. The next prime is 1020121241. The reversal of 1020121221 is 1221210201.

1020121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1020121221 - 2³ = 1020121213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121197 and 1020121206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121241) 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, 24288580 + ... + 24288621.

It is an arithmetic number, because the mean of its divisors is an integer number (194308808).

Almost surely, 2^1020121221 is an apocalyptic number.

It is an amenable number.

1020121221 is a deficient number, since it is larger than the sum of its proper divisors (534349243).

1020121221 is an equidigital number, since it uses as much as digits as its factorization.

1020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48577211.

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

The square root of 1020121221 is about 31939.3365773305. The cubic root of 1020121221 is about 1006.6625850431.

Adding to 1020121221 its reverse (1221210201), we get a palindrome (2241331422).

The spelling of 1020121221 in words is "one billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".