84021251 has 8 divisors (see below), whose sum is σ = 86410800. Its totient is φ = 81664000.

The previous prime is 84021229. The next prime is 84021257. The reversal of 84021251 is 15212048.

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

It is a cyclic number.

It is not a de Polignac number, because 84021251 - 2¹⁰ = 84020227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84021257) 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, 2750 + ... + 13251.

It is an arithmetic number, because the mean of its divisors is an integer number (10801350).

Almost surely, 2^84021251 is an apocalyptic number.

84021251 is a deficient number, since it is larger than the sum of its proper divisors (2389549).

84021251 is a wasteful number, since it uses less digits than its factorization.

84021251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16149.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 84021251 is about 9166.3106536927. The cubic root of 84021251 is about 437.9888430816.

Adding to 84021251 its reverse (15212048), we get a palindrome (99233299).

The spelling of 84021251 in words is "eighty-four million, twenty-one thousand, two hundred fifty-one".