1421216188 has 36 divisors (see below), whose sum is σ = 3045471240. Its totient is φ = 577033632.

The previous prime is 1421216179. The next prime is 1421216189. The reversal of 1421216188 is 8816121241.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421216189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187095 + ... + 194542.

Almost surely, 2^1421216188 is an apocalyptic number.

It is an amenable number.

1421216188 is an abundant number, since it is smaller than the sum of its proper divisors (1624255052).

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

1421216188 is a wasteful number, since it uses less digits than its factorization.

1421216188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381674 (or 381665 counting only the distinct ones).

The product of its digits is 6144, while the sum is 34.

The square root of 1421216188 is about 37699.0210482978. The cubic root of 1421216188 is about 1124.3116613576.

The spelling of 1421216188 in words is "one billion, four hundred twenty-one million, two hundred sixteen thousand, one hundred eighty-eight".