84421512 has 72 divisors (see below), whose sum is σ = 265981950. Its totient is φ = 24119424.

The previous prime is 84421489. The next prime is 84421517. The reversal of 84421512 is 21512448.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 18714276 = 8106^2 + 4326^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×84421512² = 14253983376732288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84421517) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8437 + ... + 15492.

Almost surely, 2^84421512 is an apocalyptic number.

It is an amenable number.

84421512 is an abundant number, since it is smaller than the sum of its proper divisors (181560438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84421512 is a wasteful number, since it uses less digits than its factorization.

84421512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23955 (or 23941 counting only the distinct ones).

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

The square root of 84421512 is about 9188.1179792164. The cubic root of 84421512 is about 438.6832396535.

The spelling of 84421512 in words is "eighty-four million, four hundred twenty-one thousand, five hundred twelve".