84402021 has 16 divisors (see below), whose sum is σ = 123153408. Its totient is φ = 50991600.

The previous prime is 84402007. The next prime is 84402049. The reversal of 84402021 is 12020448.

It is not a de Polignac number, because 84402021 - 2⁹ = 84401509 is a prime.

It is a super-2 number, since 2×84402021² = 14247402297768882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84402061) 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, 7060 + ... + 14786.

It is an arithmetic number, because the mean of its divisors is an integer number (7697088).

Almost surely, 2^84402021 is an apocalyptic number.

It is an amenable number.

84402021 is a deficient number, since it is larger than the sum of its proper divisors (38751387).

84402021 is a wasteful number, since it uses less digits than its factorization.

84402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8072.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 84402021 is about 9187.0572546382. The cubic root of 84402021 is about 438.6494764063.

Adding to 84402021 its reverse (12020448), we get a palindrome (96422469).

The spelling of 84402021 in words is "eighty-four million, four hundred two thousand, twenty-one".