2113213021 has 16 divisors (see below), whose sum is σ = 2263282560. Its totient is φ = 1968186880.

The previous prime is 2113213009. The next prime is 2113213043. The reversal of 2113213021 is 1203123112.

It is a cyclic number.

It is not a de Polignac number, because 2113213021 - 2⁵ = 2113212989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113212986 and 2113213004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113213051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557310 + ... + 561088.

It is an arithmetic number, because the mean of its divisors is an integer number (141455160).

Almost surely, 2^2113213021 is an apocalyptic number.

It is an amenable number.

2113213021 is a deficient number, since it is larger than the sum of its proper divisors (150069539).

2113213021 is a wasteful number, since it uses less digits than its factorization.

2113213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2113213021 is about 45969.6967686323. The cubic root of 2113213021 is about 1283.2593167109.

Adding to 2113213021 its reverse (1203123112), we get a palindrome (3316336133).

The spelling of 2113213021 in words is "two billion, one hundred thirteen million, two hundred thirteen thousand, twenty-one".