195121212 has 72 divisors (see below), whose sum is σ = 538981968. Its totient is φ = 54574080.

The previous prime is 195121187. The next prime is 195121217. The reversal of 195121212 is 212121591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195121217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13708 + ... + 24044.

Almost surely, 2^195121212 is an apocalyptic number.

195121212 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 195121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269490984).

195121212 is an abundant number, since it is smaller than the sum of its proper divisors (343860756).

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

195121212 is a wasteful number, since it uses less digits than its factorization.

195121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10379 (or 10366 counting only the distinct ones).

The product of its digits is 360, while the sum is 24.

The square root of 195121212 is about 13968.5794553347. The cubic root of 195121212 is about 580.0091278785.

The spelling of 195121212 in words is "one hundred ninety-five million, one hundred twenty-one thousand, two hundred twelve".