2113423221 has 32 divisors (see below), whose sum is σ = 3672200448. Its totient is φ = 1049195520.

The previous prime is 2113423163. The next prime is 2113423223. The reversal of 2113423221 is 1223243112.

It is not a de Polignac number, because 2113423221 - 2⁶ = 2113423157 is a prime.

It is a super-2 number, since 2×2113423221² = 8933115422124029682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113423223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223050 + ... + 232331.

It is an arithmetic number, because the mean of its divisors is an integer number (114756264).

Almost surely, 2^2113423221 is an apocalyptic number.

2113423221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2113423221 is a deficient number, since it is larger than the sum of its proper divisors (1558777227).

2113423221 is a wasteful number, since it uses less digits than its factorization.

2113423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455421.

The product of its digits is 576, while the sum is 21.

The square root of 2113423221 is about 45971.9830005189. The cubic root of 2113423221 is about 1283.3018636386.

Adding to 2113423221 its reverse (1223243112), we get a palindrome (3336666333).

The spelling of 2113423221 in words is "two billion, one hundred thirteen million, four hundred twenty-three thousand, two hundred twenty-one".