84421623981 has 8 divisors (see below), whose sum is σ = 115604386144. Its totient is φ = 54759972240.

The previous prime is 84421623961. The next prime is 84421624003. The reversal of 84421623981 is 18932612448.

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

It is not a de Polignac number, because 84421623981 - 2¹⁴ = 84421607597 is a prime.

It is a super-2 number, since 2×84421623981² (a number of 23 digits) contains 22 as substring.

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 84421623981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84421623911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380277475 + ... + 380277696.

It is an arithmetic number, because the mean of its divisors is an integer number (14450548268).

Almost surely, 2^84421623981 is an apocalyptic number.

It is an amenable number.

84421623981 is a deficient number, since it is larger than the sum of its proper divisors (31182762163).

84421623981 is a wasteful number, since it uses less digits than its factorization.

84421623981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760555211.

The product of its digits is 663552, while the sum is 48.

The spelling of 84421623981 in words is "eighty-four billion, four hundred twenty-one million, six hundred twenty-three thousand, nine hundred eighty-one".