212442302421 has 8 divisors (see below), whose sum is σ = 314729336960. Its totient is φ = 141628201596.

The previous prime is 212442302417. The next prime is 212442302497. The reversal of 212442302421 is 124203244212.

It is a happy number.

212442302421 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 4 + 230 + 2 + 421 = 666.

It is not a de Polignac number, because 212442302421 - 2² = 212442302417 is a prime.

It is a super-2 number, since 2×212442302421² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7868233423 = 212442302421 / (2 + 1 + 2 + 4 + 4 + 2 + 3 + 0 + 2 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212442302521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3934116685 + ... + 3934116738.

It is an arithmetic number, because the mean of its divisors is an integer number (39341167120).

Almost surely, 2^212442302421 is an apocalyptic number.

It is an amenable number.

212442302421 is a deficient number, since it is larger than the sum of its proper divisors (102287034539).

212442302421 is an equidigital number, since it uses as much as digits as its factorization.

212442302421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7868233432 (or 7868233426 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 212442302421 its reverse (124203244212), we get a palindrome (336645546633).

The spelling of 212442302421 in words is "two hundred twelve billion, four hundred forty-two million, three hundred two thousand, four hundred twenty-one".