2101421 has 8 divisors (see below), whose sum is σ = 2543040. Its totient is φ = 1695168.

The previous prime is 2101391. The next prime is 2101423. The reversal of 2101421 is 1241012.

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 2101421 - 2⁶ = 2101357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8711 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (317880).

2^2101421 is an apocalyptic number.

It is an amenable number.

2101421 is a deficient number, since it is larger than the sum of its proper divisors (441619).

2101421 is a wasteful number, since it uses less digits than its factorization.

2101421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17683.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2101421 is about 1449.6278832859. The cubic root of 2101421 is about 128.0867941607.

Adding to 2101421 its reverse (1241012), we get a palindrome (3342433).

The spelling of 2101421 in words is "two million, one hundred one thousand, four hundred twenty-one".