671101021 has 4 divisors (see below), whose sum is σ = 672207232. Its totient is φ = 669994812.

The previous prime is 671101019. The next prime is 671101037. The reversal of 671101021 is 120101176.

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 671101021 - 2¹ = 671101019 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 671101021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671101421) 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, 552195 + ... + 553408.

It is an arithmetic number, because the mean of its divisors is an integer number (168051808).

Almost surely, 2^671101021 is an apocalyptic number.

It is an amenable number.

671101021 is a deficient number, since it is larger than the sum of its proper divisors (1106211).

671101021 is a wasteful number, since it uses less digits than its factorization.

671101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106210.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 671101021 is about 25905.6175568157. The cubic root of 671101021 is about 875.5130687830.

Adding to 671101021 its reverse (120101176), we get a palindrome (791202197).

The spelling of 671101021 in words is "six hundred seventy-one million, one hundred one thousand, twenty-one".