191812212 has 60 divisors (see below), whose sum is σ = 503565216. Its totient is φ = 63666000.

The previous prime is 191812211. The next prime is 191812213. The reversal of 191812212 is 212218191.

191812212 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (191812211) and next prime (191812213).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191812211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84087 + ... + 86337.

Almost surely, 2^191812212 is an apocalyptic number.

191812212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191812212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251782608).

191812212 is an abundant number, since it is smaller than the sum of its proper divisors (311753004).

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

191812212 is a wasteful number, since it uses less digits than its factorization.

191812212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530 (or 2519 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 191812212 is about 13849.6285870777. The cubic root of 191812212 is about 576.7116854085.

The spelling of 191812212 in words is "one hundred ninety-one million, eight hundred twelve thousand, two hundred twelve".