1211001213 has 8 divisors (see below), whose sum is σ = 1615398400. Its totient is φ = 806969088.

The previous prime is 1211001193. The next prime is 1211001223. The reversal of 1211001213 is 3121001121.

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

It is not a de Polignac number, because 1211001213 - 2⁶ = 1211001149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001223) 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, 83428 + ... + 96861.

It is an arithmetic number, because the mean of its divisors is an integer number (201924800).

Almost surely, 2^1211001213 is an apocalyptic number.

It is an amenable number.

1211001213 is a deficient number, since it is larger than the sum of its proper divisors (404397187).

1211001213 is a wasteful number, since it uses less digits than its factorization.

1211001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182531.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1211001213 is about 34799.4427110550. The cubic root of 1211001213 is about 1065.8960661552.

Adding to 1211001213 its reverse (3121001121), we get a palindrome (4332002334).

The spelling of 1211001213 in words is "one billion, two hundred eleven million, one thousand, two hundred thirteen".