1211219871 has 8 divisors (see below), whose sum is σ = 1620708144. Its totient is φ = 804605760.

The previous prime is 1211219797. The next prime is 1211219873. The reversal of 1211219871 is 1789121121.

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

It is not a de Polignac number, because 1211219871 - 2¹⁷ = 1211088799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211219873) 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, 717556 + ... + 719241.

It is an arithmetic number, because the mean of its divisors is an integer number (202588518).

Almost surely, 2^1211219871 is an apocalyptic number.

1211219871 is a deficient number, since it is larger than the sum of its proper divisors (409488273).

1211219871 is a wasteful number, since it uses less digits than its factorization.

1211219871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437081.

The product of its digits is 2016, while the sum is 33.

The square root of 1211219871 is about 34802.5842574944. The cubic root of 1211219871 is about 1065.9602149145.

The spelling of 1211219871 in words is "one billion, two hundred eleven million, two hundred nineteen thousand, eight hundred seventy-one".