84512421 has 12 divisors (see below), whose sum is σ = 139512672. Its totient is φ = 48292776.

The previous prime is 84512411. The next prime is 84512429. The reversal of 84512421 is 12421548.

It is not a de Polignac number, because 84512421 - 2¹¹ = 84510373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84512429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670671 + ... + 670796.

It is an arithmetic number, because the mean of its divisors is an integer number (11626056).

Almost surely, 2^84512421 is an apocalyptic number.

It is an amenable number.

84512421 is a deficient number, since it is larger than the sum of its proper divisors (55000251).

84512421 is a wasteful number, since it uses less digits than its factorization.

84512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341480 (or 1341477 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 84512421 is about 9193.0637439322. The cubic root of 84512421 is about 438.8406479857.

Adding to 84512421 its reverse (12421548), we get a palindrome (96933969).

The spelling of 84512421 in words is "eighty-four million, five hundred twelve thousand, four hundred twenty-one".