1331500421 has 2 divisors, whose sum is σ = 1331500422. Its totient is φ = 1331500420.

The previous prime is 1331500393. The next prime is 1331500441. The reversal of 1331500421 is 1240051331.

It is an a-pointer prime, because the next prime (1331500441) can be obtained adding 1331500421 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187836225 + 143664196 = 34465^2 + 11986^2 .

It is an emirp because it is prime and its reverse (1240051331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331500421 - 2²² = 1327306117 is a prime.

It is a super-2 number, since 2×1331500421² = 3545786742246354482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1331500393 and 1331500402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331500441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665750210 + 665750211.

It is an arithmetic number, because the mean of its divisors is an integer number (665750211).

Almost surely, 2^1331500421 is an apocalyptic number.

It is an amenable number.

1331500421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331500421 is an equidigital number, since it uses as much as digits as its factorization.

1331500421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1331500421 is about 36489.7303497847. The cubic root of 1331500421 is about 1100.1378397515.

Adding to 1331500421 its reverse (1240051331), we get a palindrome (2571551752).

The spelling of 1331500421 in words is "one billion, three hundred thirty-one million, five hundred thousand, four hundred twenty-one".