1200121000 has 64 divisors (see below), whose sum is σ = 3024337680. Its totient is φ = 443116800.

The previous prime is 1200120989. The next prime is 1200121009. The reversal of 1200121000 is 1210021.

It can be written as a sum of positive squares in 8 ways, for example, as 46703556 + 1153417444 = 6834^2 + 33962^2 .

It is not an unprimeable number, because it can be changed into a prime (1200121009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33159 + ... + 59158.

Almost surely, 2^1200121000 is an apocalyptic number.

1200121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200121000 is an abundant number, since it is smaller than the sum of its proper divisors (1824216680).

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

1200121000 is a wasteful number, since it uses less digits than its factorization.

1200121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92351 (or 92337 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1200121000 is about 34642.7625919181. The cubic root of 1200121000 is about 1062.6942851174.

Adding to 1200121000 its reverse (1210021), we get a palindrome (1201331021).

The spelling of 1200121000 in words is "one billion, two hundred million, one hundred twenty-one thousand".