212211210042 has 80 divisors (see below), whose sum is σ = 513186946272. Its totient is φ = 65155635360.

The previous prime is 212211210037. The next prime is 212211210077. The reversal of 212211210042 is 240012112212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212211209997 and 212211210024.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 875617 + ... + 1091387.

Almost surely, 2^212211210042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212211210042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256593473136).

212211210042 is an abundant number, since it is smaller than the sum of its proper divisors (300975736230).

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

212211210042 is a wasteful number, since it uses less digits than its factorization.

212211210042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216265 (or 216256 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212211210042 its reverse (240012112212), we get a palindrome (452223322254).

The spelling of 212211210042 in words is "two hundred twelve billion, two hundred eleven million, two hundred ten thousand, forty-two".