212234251556 has 6 divisors (see below), whose sum is σ = 371409940230. Its totient is φ = 106117125776.

The previous prime is 212234251507. The next prime is 212234251609. The reversal of 212234251556 is 655152432212.

It can be written as a sum of positive squares in only one way, i.e., 191073894400 + 21160357156 = 437120^2 + 145466^2 .

It is a super-2 number, since 2×212234251556² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26529281441 + ... + 26529281448.

It is an arithmetic number, because the mean of its divisors is an integer number (61901656705).

Almost surely, 2^212234251556 is an apocalyptic number.

It is an amenable number.

212234251556 is a deficient number, since it is larger than the sum of its proper divisors (159175688674).

212234251556 is a wasteful number, since it uses less digits than its factorization.

212234251556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53058562893 (or 53058562891 counting only the distinct ones).

The product of its digits is 144000, while the sum is 38.

Adding to 212234251556 its reverse (655152432212), we get a palindrome (867386683768).

The spelling of 212234251556 in words is "two hundred twelve billion, two hundred thirty-four million, two hundred fifty-one thousand, five hundred fifty-six".