84450421 has 16 divisors (see below), whose sum is σ = 97943040. Its totient is φ = 72007920.

The previous prime is 84450403. The next prime is 84450427. The reversal of 84450421 is 12405448.

It is a cyclic number.

It is not a de Polignac number, because 84450421 - 2⁵ = 84450389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84450421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84450427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19566 + ... + 23488.

It is an arithmetic number, because the mean of its divisors is an integer number (6121440).

Almost surely, 2^84450421 is an apocalyptic number.

It is an amenable number.

84450421 is a deficient number, since it is larger than the sum of its proper divisors (13492619).

84450421 is a wasteful number, since it uses less digits than its factorization.

84450421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 84450421 is about 9189.6910176567. The cubic root of 84450421 is about 438.7333076444.

Adding to 84450421 its reverse (12405448), we get a palindrome (96855869).

The spelling of 84450421 in words is "eighty-four million, four hundred fifty thousand, four hundred twenty-one".