84121851 has 16 divisors (see below), whose sum is σ = 123552000. Its totient is φ = 50485920.

The previous prime is 84121847. The next prime is 84121859. The reversal of 84121851 is 15812148.

It is a happy number.

It is not a de Polignac number, because 84121851 - 2² = 84121847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84121859) 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, 8976 + ... + 15773.

It is an arithmetic number, because the mean of its divisors is an integer number (7722000).

Almost surely, 2^84121851 is an apocalyptic number.

84121851 is a deficient number, since it is larger than the sum of its proper divisors (39430149).

84121851 is a wasteful number, since it uses less digits than its factorization.

84121851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24866.

The product of its digits is 2560, while the sum is 30.

The square root of 84121851 is about 9171.7964979605. The cubic root of 84121851 is about 438.1635770667.

Adding to 84121851 its reverse (15812148), we get a palindrome (99933999).

The spelling of 84121851 in words is "eighty-four million, one hundred twenty-one thousand, eight hundred fifty-one".