521421451 has 4 divisors (see below), whose sum is σ = 524334600. Its totient is φ = 518508304.

The previous prime is 521421419. The next prime is 521421491. The reversal of 521421451 is 154124125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521421451 - 2⁵ = 521421419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521421491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1456306 + ... + 1456663.

It is an arithmetic number, because the mean of its divisors is an integer number (131083650).

Almost surely, 2^521421451 is an apocalyptic number.

521421451 is a deficient number, since it is larger than the sum of its proper divisors (2913149).

521421451 is a wasteful number, since it uses less digits than its factorization.

521421451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913148.

The product of its digits is 1600, while the sum is 25.

The square root of 521421451 is about 22834.6546065405. The cubic root of 521421451 is about 804.8772113168.

Adding to 521421451 its reverse (154124125), we get a palindrome (675545576).

The spelling of 521421451 in words is "five hundred twenty-one million, four hundred twenty-one thousand, four hundred fifty-one".