213812121228 has 12 divisors (see below), whose sum is σ = 498894949560. Its totient is φ = 71270707072.

The previous prime is 213812121181. The next prime is 213812121311. The reversal of 213812121228 is 822121218312.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8908838373 + ... + 8908838396.

It is an arithmetic number, because the mean of its divisors is an integer number (41574579130).

Almost surely, 2^213812121228 is an apocalyptic number.

It is an amenable number.

213812121228 is an abundant number, since it is smaller than the sum of its proper divisors (285082828332).

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

213812121228 is a wasteful number, since it uses less digits than its factorization.

213812121228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17817676776 (or 17817676774 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The spelling of 213812121228 in words is "two hundred thirteen billion, eight hundred twelve million, one hundred twenty-one thousand, two hundred twenty-eight".