82550421 has 20 divisors (see below), whose sum is σ = 129808800. Its totient is φ = 52136136.

The previous prime is 82550417. The next prime is 82550423. The reversal of 82550421 is 12405528.

It is a happy number.

It is not a de Polignac number, because 82550421 - 2² = 82550417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82550423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25281 + ... + 28358.

It is an arithmetic number, because the mean of its divisors is an integer number (6490440).

Almost surely, 2^82550421 is an apocalyptic number.

82550421 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

82550421 is a deficient number, since it is larger than the sum of its proper divisors (47258379).

82550421 is a wasteful number, since it uses less digits than its factorization.

82550421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53670 (or 53661 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 82550421 is about 9085.7262230380. The cubic root of 82550421 is about 435.4180523275.

Adding to 82550421 its reverse (12405528), we get a palindrome (94955949).

The spelling of 82550421 in words is "eighty-two million, five hundred fifty thousand, four hundred twenty-one".