212121354 has 32 divisors (see below), whose sum is σ = 431818560. Its totient is φ = 69455232.

The previous prime is 212121319. The next prime is 212121379. The reversal of 212121354 is 453121212.

It is a self number, because there is not a number n which added to its sum of digits gives 212121354.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85824 + ... + 88260.

It is an arithmetic number, because the mean of its divisors is an integer number (13494330).

Almost surely, 2^212121354 is an apocalyptic number.

212121354 is an abundant number, since it is smaller than the sum of its proper divisors (219697206).

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

212121354 is a wasteful number, since it uses less digits than its factorization.

212121354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694.

The product of its digits is 480, while the sum is 21.

The square root of 212121354 is about 14564.3864958329. The cubic root of 212121354 is about 596.3869478732.

Adding to 212121354 its reverse (453121212), we get a palindrome (665242566).

The spelling of 212121354 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred fifty-four".