862421521 has 8 divisors (see below), whose sum is σ = 942624704. Its totient is φ = 784198800.

The previous prime is 862421507. The next prime is 862421531. The reversal of 862421521 is 125124268.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 862421521 - 2⁷ = 862421393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (862421531) 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 7 ways as a sum of consecutive naturals, for example, 494205 + ... + 495946.

It is an arithmetic number, because the mean of its divisors is an integer number (117828088).

Almost surely, 2^862421521 is an apocalyptic number.

It is an amenable number.

862421521 is a deficient number, since it is larger than the sum of its proper divisors (80203183).

862421521 is a wasteful number, since it uses less digits than its factorization.

862421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990231.

The product of its digits is 7680, while the sum is 31.

The square root of 862421521 is about 29367.0141655566. The cubic root of 862421521 is about 951.8602592626.

Adding to 862421521 its reverse (125124268), we get a palindrome (987545789).

The spelling of 862421521 in words is "eight hundred sixty-two million, four hundred twenty-one thousand, five hundred twenty-one".