1696676021 has 4 divisors (see below), whose sum is σ = 1724490444. Its totient is φ = 1668861600.

The previous prime is 1696675997. The next prime is 1696676027. The reversal of 1696676021 is 1206766961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1206766961 = 883 ⋅1366667.

It can be written as a sum of positive squares in 2 ways, for example, as 621754225 + 1074921796 = 24935^2 + 32786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1696676021 - 2²² = 1692481717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1696676027) 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, 13907120 + ... + 13907241.

It is an arithmetic number, because the mean of its divisors is an integer number (431122611).

Almost surely, 2^1696676021 is an apocalyptic number.

It is an amenable number.

1696676021 is a deficient number, since it is larger than the sum of its proper divisors (27814423).

1696676021 is an equidigital number, since it uses as much as digits as its factorization.

1696676021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27814422.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1696676021 is about 41190.7273667266. The cubic root of 1696676021 is about 1192.7048190867.

The spelling of 1696676021 in words is "one billion, six hundred ninety-six million, six hundred seventy-six thousand, twenty-one".