1271002421 has 4 divisors (see below), whose sum is σ = 1368771852. Its totient is φ = 1173232992.

The previous prime is 1271002391. The next prime is 1271002423. The reversal of 1271002421 is 1242001721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242001721 = 6637 ⋅187133.

It can be written as a sum of positive squares in 2 ways, for example, as 303108100 + 967894321 = 17410^2 + 31111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271002421 - 2¹⁸ = 1270740277 is a prime.

It is a super-2 number, since 2×1271002421² = 3230894308375722482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1271002393 and 1271002402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271002423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48884696 + ... + 48884721.

It is an arithmetic number, because the mean of its divisors is an integer number (342192963).

Almost surely, 2^1271002421 is an apocalyptic number.

It is an amenable number.

1271002421 is a deficient number, since it is larger than the sum of its proper divisors (97769431).

1271002421 is an equidigital number, since it uses as much as digits as its factorization.

1271002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97769430.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 1271002421 is about 35651.1208940196. The cubic root of 1271002421 is about 1083.2169801875.

The spelling of 1271002421 in words is "one billion, two hundred seventy-one million, two thousand, four hundred twenty-one".