2028597921 has 12 divisors (see below), whose sum is σ = 3348796672. Its totient is φ = 1159198776.

The previous prime is 2028597919. The next prime is 2028597929. The reversal of 2028597921 is 1297958202.

It is a happy number.

It is not a de Polignac number, because 2028597921 - 2¹ = 2028597919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028597929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16099921 + ... + 16100046.

Almost surely, 2^2028597921 is an apocalyptic number.

2028597921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2028597921 is a deficient number, since it is larger than the sum of its proper divisors (1320198751).

2028597921 is a wasteful number, since it uses less digits than its factorization.

2028597921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32199980 (or 32199977 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2028597921 is about 45039.9591585072. The cubic root of 2028597921 is about 1265.8978395885.

The spelling of 2028597921 in words is "two billion, twenty-eight million, five hundred ninety-seven thousand, nine hundred twenty-one".