2196621 has 36 divisors (see below), whose sum is σ = 3921372. Its totient is φ = 1177344.

The previous prime is 2196619. The next prime is 2196641. The reversal of 2196621 is 1266912.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 275625 = 1386^2 + 525^2 .

It is not a de Polignac number, because 2196621 - 2¹ = 2196619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2196611) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7351 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2^2196621 is an apocalyptic number.

2196621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2196621 is a deficient number, since it is larger than the sum of its proper divisors (1724751).

2196621 is a wasteful number, since it uses less digits than its factorization.

2196621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 320 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2196621 is about 1482.1001990419. The cubic root of 2196621 is about 129.9925242249.

The spelling of 2196621 in words is "two million, one hundred ninety-six thousand, six hundred twenty-one".