82238021 has 4 divisors (see below), whose sum is σ = 82259232. Its totient is φ = 82216812.

The previous prime is 82238003. The next prime is 82238029. The reversal of 82238021 is 12083228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82238021 - 2¹⁴ = 82221637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82238029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 13158.

It is an arithmetic number, because the mean of its divisors is an integer number (20564808).

Almost surely, 2^82238021 is an apocalyptic number.

It is an amenable number.

82238021 is a deficient number, since it is larger than the sum of its proper divisors (21211).

82238021 is a wasteful number, since it uses less digits than its factorization.

82238021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21210.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 82238021 is about 9068.5181259123. The cubic root of 82238021 is about 434.8680993494.

The spelling of 82238021 in words is "eighty-two million, two hundred thirty-eight thousand, twenty-one".