264402421 has 2 divisors, whose sum is σ = 264402422. Its totient is φ = 264402420.

The previous prime is 264402419. The next prime is 264402431. The reversal of 264402421 is 124204462.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144937521 + 119464900 = 12039^2 + 10930^2 .

It is a cyclic number.

It is not a de Polignac number, because 264402421 - 2¹ = 264402419 is a prime.

It is a super-2 number, since 2×264402421² = 139817280461322482, which contains 22 as substring.

Together with 264402419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264402431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132201210 + 132201211.

It is an arithmetic number, because the mean of its divisors is an integer number (132201211).

Almost surely, 2^264402421 is an apocalyptic number.

It is an amenable number.

264402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

264402421 is an equidigital number, since it uses as much as digits as its factorization.

264402421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 264402421 is about 16260.4557439206. The cubic root of 264402421 is about 641.8326548560.

Adding to 264402421 its reverse (124204462), we get a palindrome (388606883).

The spelling of 264402421 in words is "two hundred sixty-four million, four hundred two thousand, four hundred twenty-one".