1201021220 has 96 divisors (see below), whose sum is σ = 3000238080. Its totient is φ = 395176320.

The previous prime is 1201021201. The next prime is 1201021249. The reversal of 1201021220 is 221201021.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550091 + ... + 552269.

It is an arithmetic number, because the mean of its divisors is an integer number (31252480).

Almost surely, 2^1201021220 is an apocalyptic number.

1201021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1500119040).

1201021220 is an abundant number, since it is smaller than the sum of its proper divisors (1799216860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201021220 is a wasteful number, since it uses less digits than its factorization.

1201021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353 (or 2351 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1201021220 is about 34655.7530577536. The cubic root of 1201021220 is about 1062.9599304287.

Adding to 1201021220 its reverse (221201021), we get a palindrome (1422222241).

The spelling of 1201021220 in words is "one billion, two hundred one million, twenty-one thousand, two hundred twenty".