1696201021 has 4 divisors (see below), whose sum is σ = 1717672000. Its totient is φ = 1674730044.

The previous prime is 1696201009. The next prime is 1696201049. The reversal of 1696201021 is 1201026961.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201026961 = 359 ⋅3345479.

It is a cyclic number.

It is not a de Polignac number, because 1696201021 - 2²¹ = 1694103869 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 (1696201051) 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, 10735371 + ... + 10735528.

It is an arithmetic number, because the mean of its divisors is an integer number (429418000).

Almost surely, 2^1696201021 is an apocalyptic number.

It is an amenable number.

1696201021 is a deficient number, since it is larger than the sum of its proper divisors (21470979).

1696201021 is an equidigital number, since it uses as much as digits as its factorization.

1696201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21470978.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1696201021 is about 41184.9611023247. The cubic root of 1696201021 is about 1192.5935058171.

Adding to 1696201021 its reverse (1201026961), we get a palindrome (2897227982).

The spelling of 1696201021 in words is "one billion, six hundred ninety-six million, two hundred one thousand, twenty-one".