1200220121 has 8 divisors (see below), whose sum is σ = 1214312040. Its totient is φ = 1186189312.

The previous prime is 1200220081. The next prime is 1200220157. The reversal of 1200220121 is 1210220021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 290521 + 1199929600 = 539^2 + 34640^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200220121 - 2⁶ = 1200220057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200220321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24845 + ... + 54933.

It is an arithmetic number, because the mean of its divisors is an integer number (151789005).

Almost surely, 2^1200220121 is an apocalyptic number.

It is an amenable number.

1200220121 is a deficient number, since it is larger than the sum of its proper divisors (14091919).

1200220121 is a wasteful number, since it uses less digits than its factorization.

1200220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30555.

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

The square root of 1200220121 is about 34644.1931786555. The cubic root of 1200220121 is about 1062.7235411731.

Adding to 1200220121 its reverse (1210220021), we get a palindrome (2410440142).

It can be divided in two parts, 12002 and 20121, that added together give a palindrome (32123).

The spelling of 1200220121 in words is "one billion, two hundred million, two hundred twenty thousand, one hundred twenty-one".