212420331 has 12 divisors (see below), whose sum is σ = 317410080. Its totient is φ = 136730160.

The previous prime is 212420311. The next prime is 212420347. The reversal of 212420331 is 133024212.

212420331 is a `hidden beast` number, since 212 + 420 + 3 + 31 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-212420331 is a prime.

It is a super-2 number, since 2×212420331² = 90244794044299122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212420311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406675 + ... + 407196.

It is an arithmetic number, because the mean of its divisors is an integer number (26450840).

Almost surely, 2^212420331 is an apocalyptic number.

212420331 is a deficient number, since it is larger than the sum of its proper divisors (104989749).

212420331 is a wasteful number, since it uses less digits than its factorization.

212420331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813906 (or 813903 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212420331 is about 14574.6468567852. The cubic root of 212420331 is about 596.6670112597.

Adding to 212420331 its reverse (133024212), we get a palindrome (345444543).

The spelling of 212420331 in words is "two hundred twelve million, four hundred twenty thousand, three hundred thirty-one".