2101423221 has 48 divisors (see below), whose sum is σ = 3242209152. Its totient is φ = 1308700800.

The previous prime is 2101423211. The next prime is 2101423243. The reversal of 2101423221 is 1223241012.

It is a happy number.

2101423221 is a `hidden beast` number, since 21 + 0 + 1 + 423 + 221 = 666.

It is not a de Polignac number, because 2101423221 - 2⁵ = 2101423189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2101423194 and 2101423203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101423211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2057691 + ... + 2058711.

It is an arithmetic number, because the mean of its divisors is an integer number (67546024).

Almost surely, 2^2101423221 is an apocalyptic number.

It is an amenable number.

2101423221 is a deficient number, since it is larger than the sum of its proper divisors (1140785931).

2101423221 is a wasteful number, since it uses less digits than its factorization.

2101423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1271 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2101423221 is about 45841.2829336178. The cubic root of 2101423221 is about 1280.8683928584.

Adding to 2101423221 its reverse (1223241012), we get a palindrome (3324664233).

The spelling of 2101423221 in words is "two billion, one hundred one million, four hundred twenty-three thousand, two hundred twenty-one".