2106621 has 32 divisors (see below), whose sum is σ = 3507840. Its totient is φ = 1238400.

The previous prime is 2106619. The next prime is 2106631. The reversal of 2106621 is 1266012.

It is a happy number.

2106621 is a `hidden beast` number, since 2 + 1 + 0 + 662 + 1 = 666.

It is not a de Polignac number, because 2106621 - 2¹ = 2106619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2106594 and 2106603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106631) 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, 12091 + ... + 12263.

It is an arithmetic number, because the mean of its divisors is an integer number (109620).

2^2106621 is an apocalyptic number.

It is an amenable number.

2106621 is a deficient number, since it is larger than the sum of its proper divisors (1401219).

2106621 is a wasteful number, since it uses less digits than its factorization.

2106621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2106621 is about 1451.4203388405. The cubic root of 2106621 is about 128.1923580781.

The spelling of 2106621 in words is "two million, one hundred six thousand, six hundred twenty-one".