212811332 has 6 divisors (see below), whose sum is σ = 372419838. Its totient is φ = 106405664.

The previous prime is 212811331. The next prime is 212811409. The reversal of 212811332 is 233118212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 203176516 + 9634816 = 14254^2 + 3104^2 .

It is a super-2 number, since 2×212811332² = 90577326055228448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212811298 and 212811307.

It is not an unprimeable number, because it can be changed into a prime (212811331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26601413 + ... + 26601420.

It is an arithmetic number, because the mean of its divisors is an integer number (62069973).

Almost surely, 2^212811332 is an apocalyptic number.

It is an amenable number.

212811332 is a deficient number, since it is larger than the sum of its proper divisors (159608506).

212811332 is a wasteful number, since it uses less digits than its factorization.

212811332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53202837 (or 53202835 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 212811332 is about 14588.0544281957. The cubic root of 212811332 is about 597.0328808229.

Adding to 212811332 its reverse (233118212), we get a palindrome (445929544).

The spelling of 212811332 in words is "two hundred twelve million, eight hundred eleven thousand, three hundred thirty-two".