421617247 has 2 divisors, whose sum is σ = 421617248. Its totient is φ = 421617246.

The previous prime is 421617223. The next prime is 421617253. The reversal of 421617247 is 742716124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421617247 is a prime.

It is a super-2 number, since 2×421617247² = 355522205935718018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421617047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210808623 + 210808624.

It is an arithmetic number, because the mean of its divisors is an integer number (210808624).

Almost surely, 2^421617247 is an apocalyptic number.

421617247 is a deficient number, since it is larger than the sum of its proper divisors (1).

421617247 is an equidigital number, since it uses as much as digits as its factorization.

421617247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 34.

The square root of 421617247 is about 20533.3204085457. The cubic root of 421617247 is about 749.8472263639.

The spelling of 421617247 in words is "four hundred twenty-one million, six hundred seventeen thousand, two hundred forty-seven".