212120402442 has 64 divisors (see below), whose sum is σ = 467561445120. Its totient is φ = 63758016000.

The previous prime is 212120402419. The next prime is 212120402447. The reversal of 212120402442 is 244204021212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (212120402447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427942 + ... + 779342.

It is an arithmetic number, because the mean of its divisors is an integer number (7305647580).

Almost surely, 2^212120402442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212120402442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233780722560).

212120402442 is an abundant number, since it is smaller than the sum of its proper divisors (255441042678).

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

212120402442 is a wasteful number, since it uses less digits than its factorization.

212120402442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351599.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 212120402442 its reverse (244204021212), we get a palindrome (456324423654).

The spelling of 212120402442 in words is "two hundred twelve billion, one hundred twenty million, four hundred two thousand, four hundred forty-two".