84002121 has 36 divisors (see below), whose sum is σ = 143303472. Its totient is φ = 47268144.

The previous prime is 84002119. The next prime is 84002131. The reversal of 84002121 is 12120048.

It is not a de Polignac number, because 84002121 - 2¹ = 84002119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84002094 and 84002103.

It is not an unprimeable number, because it can be changed into a prime (84002101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28126 + ... + 30968.

It is an arithmetic number, because the mean of its divisors is an integer number (3980652).

Almost surely, 2^84002121 is an apocalyptic number.

It is an amenable number.

84002121 is a deficient number, since it is larger than the sum of its proper divisors (59301351).

84002121 is a wasteful number, since it uses less digits than its factorization.

84002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930 (or 2920 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 84002121 is about 9165.2670992176. The cubic root of 84002121 is about 437.9556000530.

Adding to 84002121 its reverse (12120048), we get a palindrome (96122169).

The spelling of 84002121 in words is "eighty-four million, two thousand, one hundred twenty-one".