216276421 has 2 divisors, whose sum is σ = 216276422. Its totient is φ = 216276420.

The previous prime is 216276391. The next prime is 216276493. The reversal of 216276421 is 124672612.

216276421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173844225 + 42432196 = 13185^2 + 6514^2 .

It is a cyclic number.

It is not a de Polignac number, because 216276421 - 2⁹ = 216275909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216276121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108138210 + 108138211.

It is an arithmetic number, because the mean of its divisors is an integer number (108138211).

Almost surely, 2^216276421 is an apocalyptic number.

It is an amenable number.

216276421 is a deficient number, since it is larger than the sum of its proper divisors (1).

216276421 is an equidigital number, since it uses as much as digits as its factorization.

216276421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 216276421 is about 14706.3394833657. The cubic root of 216276421 is about 600.2558362679.

The spelling of 216276421 in words is "two hundred sixteen million, two hundred seventy-six thousand, four hundred twenty-one".