468215821 has 2 divisors, whose sum is σ = 468215822. Its totient is φ = 468215820.

The previous prime is 468215771. The next prime is 468215827. The reversal of 468215821 is 128512864.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402443721 + 65772100 = 20061^2 + 8110^2 .

It is a cyclic number.

It is not a de Polignac number, because 468215821 - 2²¹ = 466118669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (468215827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 234107910 + 234107911.

It is an arithmetic number, because the mean of its divisors is an integer number (234107911).

Almost surely, 2^468215821 is an apocalyptic number.

It is an amenable number.

468215821 is a deficient number, since it is larger than the sum of its proper divisors (1).

468215821 is an equidigital number, since it uses as much as digits as its factorization.

468215821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 468215821 is about 21638.2952424631. The cubic root of 468215821 is about 776.5129355103.

It can be divided in two parts, 4682 and 15821, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 468215821 in words is "four hundred sixty-eight million, two hundred fifteen thousand, eight hundred twenty-one".