1211989321 has 8 divisors (see below), whose sum is σ = 1232962560. Its totient is φ = 1191194928.

The previous prime is 1211989253. The next prime is 1211989327. The reversal of 1211989321 is 1239891121.

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 1211989321 - 2²⁵ = 1178434889 is a prime.

It is a super-2 number, since 2×1211989321² = 2937836228436082082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211989327) 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, 31006 + ... + 58183.

It is an arithmetic number, because the mean of its divisors is an integer number (154120320).

Almost surely, 2^1211989321 is an apocalyptic number.

It is an amenable number.

1211989321 is a deficient number, since it is larger than the sum of its proper divisors (20973239).

1211989321 is a wasteful number, since it uses less digits than its factorization.

1211989321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89423.

The product of its digits is 7776, while the sum is 37.

The square root of 1211989321 is about 34813.6369975905. The cubic root of 1211989321 is about 1066.1858908316.

The spelling of 1211989321 in words is "one billion, two hundred eleven million, nine hundred eighty-nine thousand, three hundred twenty-one".