1020221206 has 4 divisors (see below), whose sum is σ = 1530331812. Its totient is φ = 510110602.

The previous prime is 1020221179. The next prime is 1020221231. The reversal of 1020221206 is 6021220201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6021220201 = 8387 ⋅717923.

It is a self number, because there is not a number n which added to its sum of digits gives 1020221206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255055300 + ... + 255055303.

It is an arithmetic number, because the mean of its divisors is an integer number (382582953).

Almost surely, 2^1020221206 is an apocalyptic number.

1020221206 is a deficient number, since it is larger than the sum of its proper divisors (510110606).

1020221206 is an equidigital number, since it uses as much as digits as its factorization.

1020221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510110605.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020221206 is about 31940.9017718661. The cubic root of 1020221206 is about 1006.6954725955.

Adding to 1020221206 its reverse (6021220201), we get a palindrome (7041441407).

It can be divided in two parts, 10202 and 21206, that multiplied together give a palindrome (216343612).

The spelling of 1020221206 in words is "one billion, twenty million, two hundred twenty-one thousand, two hundred six".