1421216187 has 4 divisors (see below), whose sum is σ = 1894954920. Its totient is φ = 947477456.

The previous prime is 1421216179. The next prime is 1421216189. The reversal of 1421216187 is 7816121241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7816121241 = 3 ⋅2605373747.

It is a cyclic number.

It is not a de Polignac number, because 1421216187 - 2³ = 1421216179 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 236869362 + ... + 236869367.

It is an arithmetic number, because the mean of its divisors is an integer number (473738730).

Almost surely, 2^1421216187 is an apocalyptic number.

1421216187 is a deficient number, since it is larger than the sum of its proper divisors (473738733).

1421216187 is an equidigital number, since it uses as much as digits as its factorization.

1421216187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473738732.

The product of its digits is 5376, while the sum is 33.

The square root of 1421216187 is about 37699.0210350348. The cubic root of 1421216187 is about 1124.3116610939.

The spelling of 1421216187 in words is "one billion, four hundred twenty-one million, two hundred sixteen thousand, one hundred eighty-seven".