2117021 has 8 divisors (see below), whose sum is σ = 2233344. Its totient is φ = 2003760.

The previous prime is 2116997. The next prime is 2117039. The reversal of 2117021 is 1207112.

2117021 = T₄₈ + T₄₉ + ... + T₂₃₃.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2117021 - 2⁶ = 2116957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2116987 and 2117005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (279168).

2^2117021 is an apocalyptic number.

It is an amenable number.

2117021 is a deficient number, since it is larger than the sum of its proper divisors (116323).

2117021 is a wasteful number, since it uses less digits than its factorization.

2117021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 2117021 is about 1454.9986254289. The cubic root of 2117021 is about 128.4029659030.

Subtracting from 2117021 its reverse (1207112), we obtain a palindrome (909909).

The spelling of 2117021 in words is "two million, one hundred seventeen thousand, twenty-one".