212154220342 has 8 divisors (see below), whose sum is σ = 320183670456. Its totient is φ = 105426330192.

The previous prime is 212154220309. The next prime is 212154220349. The reversal of 212154220342 is 243022451212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 212154220342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212154220349) 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, 325389583 + ... + 325390234.

It is an arithmetic number, because the mean of its divisors is an integer number (40022958807).

Almost surely, 2^212154220342 is an apocalyptic number.

212154220342 is a deficient number, since it is larger than the sum of its proper divisors (108029450114).

212154220342 is a wasteful number, since it uses less digits than its factorization.

212154220342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650779982.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 212154220342 its reverse (243022451212), we get a palindrome (455176671554).

The spelling of 212154220342 in words is "two hundred twelve billion, one hundred fifty-four million, two hundred twenty thousand, three hundred forty-two".