2471566421 has 2 divisors, whose sum is σ = 2471566422. Its totient is φ = 2471566420.

The previous prime is 2471566399. The next prime is 2471566423. The reversal of 2471566421 is 1246651742.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1741810225 + 729756196 = 41735^2 + 27014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2471566421 is a prime.

It is a super-2 number, since 2×2471566421² = 12217281146829498482, which contains 22 as substring.

Together with 2471566423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2471566423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1235783210 + 1235783211.

It is an arithmetic number, because the mean of its divisors is an integer number (1235783211).

Almost surely, 2^2471566421 is an apocalyptic number.

It is an amenable number.

2471566421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2471566421 is an equidigital number, since it uses as much as digits as its factorization.

2471566421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 2471566421 is about 49714.8511111117. The cubic root of 2471566421 is about 1352.0438033977.

The spelling of 2471566421 in words is "two billion, four hundred seventy-one million, five hundred sixty-six thousand, four hundred twenty-one".