421523147 has 2 divisors, whose sum is σ = 421523148. Its totient is φ = 421523146.

The previous prime is 421523131. The next prime is 421523153. The reversal of 421523147 is 741325124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421523147 - 2⁴ = 421523131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421522147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210761573 + 210761574.

It is an arithmetic number, because the mean of its divisors is an integer number (210761574).

Almost surely, 2^421523147 is an apocalyptic number.

421523147 is a deficient number, since it is larger than the sum of its proper divisors (1).

421523147 is an equidigital number, since it uses as much as digits as its factorization.

421523147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 421523147 is about 20531.0288831320. The cubic root of 421523147 is about 749.7914365256.

The spelling of 421523147 in words is "four hundred twenty-one million, five hundred twenty-three thousand, one hundred forty-seven".