212154220442 has 16 divisors (see below), whose sum is σ = 338194196352. Its totient is φ = 99468872640.

The previous prime is 212154220441. The next prime is 212154220477. The reversal of 212154220442 is 244022451212.

It is not an unprimeable number, because it can be changed into a prime (212154220441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11503388 + ... + 11521815.

It is an arithmetic number, because the mean of its divisors is an integer number (21137137272).

Almost surely, 2^212154220442 is an apocalyptic number.

212154220442 is a deficient number, since it is larger than the sum of its proper divisors (126039975910).

212154220442 is a wasteful number, since it uses less digits than its factorization.

212154220442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23025493.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 212154220442 its reverse (244022451212), we get a palindrome (456176671654).

The spelling of 212154220442 in words is "two hundred twelve billion, one hundred fifty-four million, two hundred twenty thousand, four hundred forty-two".