2133621 has 40 divisors (see below), whose sum is σ = 3763584. Its totient is φ = 1179360.

The previous prime is 2133613. The next prime is 2133631. The reversal of 2133621 is 1263312.

It is not a de Polignac number, because 2133621 - 2³ = 2133613 is a prime.

2133621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2133594 and 2133603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133601) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30016 + ... + 30086.

2^2133621 is an apocalyptic number.

2133621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2133621 is a deficient number, since it is larger than the sum of its proper divisors (1629963).

2133621 is an equidigital number, since it uses as much as digits as its factorization.

2133621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 134 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 2133621 is about 1460.6919593124. The cubic root of 2133621 is about 128.7377039189.

Adding to 2133621 its reverse (1263312), we get a palindrome (3396933).

The spelling of 2133621 in words is "two million, one hundred thirty-three thousand, six hundred twenty-one".