82755021 has 4 divisors (see below), whose sum is σ = 110340032. Its totient is φ = 55170012.

The previous prime is 82755007. The next prime is 82755073. The reversal of 82755021 is 12055728.

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 not a de Polignac number, because 82755021 - 2⁶ = 82754957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82755021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82755221) 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, 13792501 + ... + 13792506.

It is an arithmetic number, because the mean of its divisors is an integer number (27585008).

Almost surely, 2^82755021 is an apocalyptic number.

It is an amenable number.

82755021 is a deficient number, since it is larger than the sum of its proper divisors (27585011).

82755021 is a wasteful number, since it uses less digits than its factorization.

82755021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27585010.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 82755021 is about 9096.9786742632. The cubic root of 82755021 is about 435.7774812831. Note that the first 3 decimals are identical.

The spelling of 82755021 in words is "eighty-two million, seven hundred fifty-five thousand, twenty-one".