1021201209 has 32 divisors (see below), whose sum is σ = 1764320000. Its totient is φ = 583538256.

The previous prime is 1021201201. The next prime is 1021201217. The reversal of 1021201209 is 9021021201.

It is an interprime number because it is at equal distance from previous prime (1021201201) and next prime (1021201217).

It is not a de Polignac number, because 1021201209 - 2³ = 1021201201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021201191 and 1021201200.

It is not an unprimeable number, because it can be changed into a prime (1021201201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45874 + ... + 64395.

It is an arithmetic number, because the mean of its divisors is an integer number (55135000).

Almost surely, 2^1021201209 is an apocalyptic number.

It is an amenable number.

1021201209 is a deficient number, since it is larger than the sum of its proper divisors (743118791).

1021201209 is an equidigital number, since it uses as much as digits as its factorization.

1021201209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110299 (or 110279 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1021201209 is about 31956.2389683142. The cubic root of 1021201209 is about 1007.0177062623.

The spelling of 1021201209 in words is "one billion, twenty-one million, two hundred one thousand, two hundred nine".