212242120040 has 32 divisors (see below), whose sum is σ = 477603487080. Its totient is φ = 84886409472.

The previous prime is 212242120039. The next prime is 212242120063. The reversal of 212242120040 is 40021242212.

It can be written as a sum of positive squares in 4 ways, for example, as 107438417284 + 104803702756 = 327778^2 + 323734^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212242119994 and 212242120021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7394 + ... + 651566.

Almost surely, 2^212242120040 is an apocalyptic number.

212242120040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212242120040 is an abundant number, since it is smaller than the sum of its proper divisors (265361367040).

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

212242120040 is a wasteful number, since it uses less digits than its factorization.

212242120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652421 (or 652417 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 212242120040 its reverse (40021242212), we get a palindrome (252263362252).

The spelling of 212242120040 in words is "two hundred twelve billion, two hundred forty-two million, one hundred twenty thousand, forty".