82121374 has 4 divisors (see below), whose sum is σ = 123182064. Its totient is φ = 41060686.

The previous prime is 82121371. The next prime is 82121381. The reversal of 82121374 is 47312128.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20530342 + ... + 20530345.

It is an arithmetic number, because the mean of its divisors is an integer number (30795516).

Almost surely, 2^82121374 is an apocalyptic number.

82121374 is a deficient number, since it is larger than the sum of its proper divisors (41060690).

82121374 is a wasteful number, since it uses less digits than its factorization.

82121374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41060689.

The product of its digits is 2688, while the sum is 28.

The square root of 82121374 is about 9062.0844180575. The cubic root of 82121374 is about 434.6623953823.

The spelling of 82121374 in words is "eighty-two million, one hundred twenty-one thousand, three hundred seventy-four".