1200121213 has 4 divisors (see below), whose sum is σ = 1204362208. Its totient is φ = 1195880220.

The previous prime is 1200121207. The next prime is 1200121217. The reversal of 1200121213 is 3121210021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3121210021 = 313 ⋅9971917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200121213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200121193 and 1200121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120073 + ... + 2120638.

It is an arithmetic number, because the mean of its divisors is an integer number (301090552).

Almost surely, 2^1200121213 is an apocalyptic number.

It is an amenable number.

1200121213 is a deficient number, since it is larger than the sum of its proper divisors (4240995).

1200121213 is an equidigital number, since it uses as much as digits as its factorization.

1200121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240994.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1200121213 is about 34642.7656661532. The cubic root of 1200121213 is about 1062.6943479872.

Adding to 1200121213 its reverse (3121210021), we get a palindrome (4321331234).

The spelling of 1200121213 in words is "one billion, two hundred million, one hundred twenty-one thousand, two hundred thirteen".