1213002128 has 40 divisors (see below), whose sum is σ = 2533072248. Its totient is φ = 559383552.

The previous prime is 1213002121. The next prime is 1213002151. The reversal of 1213002128 is 8212003121.

It can be written as a sum of positive squares in 4 ways, for example, as 26337424 + 1186664704 = 5132^2 + 34448^2 .

It is not an unprimeable number, because it can be changed into a prime (1213002121) 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, 496526 + ... + 498962.

Almost surely, 2^1213002128 is an apocalyptic number.

It is an amenable number.

1213002128 is an abundant number, since it is smaller than the sum of its proper divisors (1320070120).

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

1213002128 is a wasteful number, since it uses less digits than its factorization.

1213002128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851 (or 4845 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1213002128 is about 34828.1800845235. The cubic root of 1213002128 is about 1066.4827966052.

Adding to 1213002128 its reverse (8212003121), we get a palindrome (9425005249).

The spelling of 1213002128 in words is "one billion, two hundred thirteen million, two thousand, one hundred twenty-eight".