82047921 has 16 divisors (see below), whose sum is σ = 110994624. Its totient is φ = 53905664.

The previous prime is 82047887. The next prime is 82047941. The reversal of 82047921 is 12974028.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 82047921 - 2⁶ = 82047857 is a prime.

It is a super-2 number, since 2×82047921² = 13463722680844482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82047941) 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, 74245 + ... + 75341.

It is an arithmetic number, because the mean of its divisors is an integer number (6937164).

Almost surely, 2^82047921 is an apocalyptic number.

It is an amenable number.

82047921 is a deficient number, since it is larger than the sum of its proper divisors (28946703).

82047921 is a wasteful number, since it uses less digits than its factorization.

82047921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 82047921 is about 9058.0307462494. The cubic root of 82047921 is about 434.5327629486.

The spelling of 82047921 in words is "eighty-two million, forty-seven thousand, nine hundred twenty-one".