212146421 has 2 divisors, whose sum is σ = 212146422. Its totient is φ = 212146420.

The previous prime is 212146409. The next prime is 212146433. The reversal of 212146421 is 124641212.

212146421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (212146409) and next prime (212146433).

It can be written as a sum of positive squares in only one way, i.e., 199798225 + 12348196 = 14135^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 212146421 - 2²² = 207952117 is a prime.

It is a super-2 number, since 2×212146421² = 90012207886218482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212146481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106073210 + 106073211.

It is an arithmetic number, because the mean of its divisors is an integer number (106073211).

Almost surely, 2^212146421 is an apocalyptic number.

It is an amenable number.

212146421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212146421 is an equidigital number, since it uses as much as digits as its factorization.

212146421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 212146421 is about 14565.2470284578. The cubic root of 212146421 is about 596.4104392105.

Adding to 212146421 its reverse (124641212), we get a palindrome (336787633).

The spelling of 212146421 in words is "two hundred twelve million, one hundred forty-six thousand, four hundred twenty-one".