1220021200 has 60 divisors (see below), whose sum is σ = 3058563168. Its totient is φ = 466787200.

The previous prime is 1220021191. The next prime is 1220021203. The reversal of 1220021200 is 21200221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57106 + ... + 75505.

Almost surely, 2^1220021200 is an apocalyptic number.

1220021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021200 is an abundant number, since it is smaller than the sum of its proper divisors (1838541968).

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

1220021200 is a wasteful number, since it uses less digits than its factorization.

1220021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132652 (or 132641 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1220021200 is about 34928.8018689448. The cubic root of 1220021200 is about 1068.5359194109.

Adding to 1220021200 its reverse (21200221), we get a palindrome (1241221421).

It can be divided in two parts, 1220021 and 200, that added together give a palindrome (1220221).

The spelling of 1220021200 in words is "one billion, two hundred twenty million, twenty-one thousand, two hundred".