2009597021 has 16 divisors (see below), whose sum is σ = 2147212800. Its totient is φ = 1877133888.

The previous prime is 2009596991. The next prime is 2009597027. The reversal of 2009597021 is 1207959002.

It is a cyclic number.

It is not a de Polignac number, because 2009597021 - 2²⁶ = 1942488157 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 (2009597027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186836 + ... + 197298.

It is an arithmetic number, because the mean of its divisors is an integer number (134200800).

Almost surely, 2^2009597021 is an apocalyptic number.

It is an amenable number.

2009597021 is a deficient number, since it is larger than the sum of its proper divisors (137615779).

2009597021 is a wasteful number, since it uses less digits than its factorization.

2009597021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10708.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 2009597021 is about 44828.5290969936. The cubic root of 2009597021 is about 1261.9330831931.

The spelling of 2009597021 in words is "two billion, nine million, five hundred ninety-seven thousand, twenty-one".