1672613021 has 4 divisors (see below), whose sum is σ = 1672784700. Its totient is φ = 1672441344.

The previous prime is 1672612973. The next prime is 1672613039. The reversal of 1672613021 is 1203162761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203162761 = 16427 ⋅73243.

It can be written as a sum of positive squares in 2 ways, for example, as 243016921 + 1429596100 = 15589^2 + 37810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1672613021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672613071) 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, 70286 + ... + 91023.

It is an arithmetic number, because the mean of its divisors is an integer number (418196175).

Almost surely, 2^1672613021 is an apocalyptic number.

It is an amenable number.

1672613021 is a deficient number, since it is larger than the sum of its proper divisors (171679).

1672613021 is a wasteful number, since it uses less digits than its factorization.

1672613021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171678.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1672613021 is about 40897.5918728719. The cubic root of 1672613021 is about 1187.0394644249.

Adding to 1672613021 its reverse (1203162761), we get a palindrome (2875775782).

The spelling of 1672613021 in words is "one billion, six hundred seventy-two million, six hundred thirteen thousand, twenty-one".