474020821 has 2 divisors, whose sum is σ = 474020822. Its totient is φ = 474020820.

The previous prime is 474020791. The next prime is 474020831. The reversal of 474020821 is 128020474.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 46771921 = 20670^2 + 6839^2 .

It is a cyclic number.

It is not a de Polignac number, because 474020821 - 2⁷ = 474020693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 474020821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (474020831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237010410 + 237010411.

It is an arithmetic number, because the mean of its divisors is an integer number (237010411).

Almost surely, 2^474020821 is an apocalyptic number.

It is an amenable number.

474020821 is a deficient number, since it is larger than the sum of its proper divisors (1).

474020821 is an equidigital number, since it uses as much as digits as its factorization.

474020821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 474020821 is about 21772.0192219279. The cubic root of 474020821 is about 779.7088662552.

The spelling of 474020821 in words is "four hundred seventy-four million, twenty thousand, eight hundred twenty-one".