212440311442 has 4 divisors (see below), whose sum is σ = 318660467166. Its totient is φ = 106220155720.

The previous prime is 212440311427. The next prime is 212440311553. The reversal of 212440311442 is 244113044212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 156318227641 + 56122083801 = 395371^2 + 236901^2 .

It is a super-2 number, since 2×212440311442² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212440311442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53110077859 + ... + 53110077862.

Almost surely, 2^212440311442 is an apocalyptic number.

212440311442 is a deficient number, since it is larger than the sum of its proper divisors (106220155724).

212440311442 is a wasteful number, since it uses less digits than its factorization.

212440311442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106220155723.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 212440311442 its reverse (244113044212), we get a palindrome (456553355654).

The spelling of 212440311442 in words is "two hundred twelve billion, four hundred forty million, three hundred eleven thousand, four hundred forty-two".