1020211221 has 16 divisors (see below), whose sum is σ = 1369619264. Its totient is φ = 675489024.

The previous prime is 1020211219. The next prime is 1020211229. The reversal of 1020211221 is 1221120201.

1020211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1020211221 - 2¹ = 1020211219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020211197 and 1020211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020211229) 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, 278226 + ... + 281868.

It is an arithmetic number, because the mean of its divisors is an integer number (85601204).

Almost surely, 2^1020211221 is an apocalyptic number.

It is an amenable number.

1020211221 is a deficient number, since it is larger than the sum of its proper divisors (349408043).

1020211221 is a wasteful number, since it uses less digits than its factorization.

1020211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260.

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

The square root of 1020211221 is about 31940.7454671928. The cubic root of 1020211221 is about 1006.6921883773.

Adding to 1020211221 its reverse (1221120201), we get a palindrome (2241331422).

The spelling of 1020211221 in words is "one billion, twenty million, two hundred eleven thousand, two hundred twenty-one".