2192421 has 16 divisors (see below), whose sum is σ = 3644928. Its totient is φ = 1138800.

The previous prime is 2192417. The next prime is 2192423. The reversal of 2192421 is 1242912.

It is not a de Polignac number, because 2192421 - 2² = 2192417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2192423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4515 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (227808).

2^2192421 is an apocalyptic number.

2192421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2192421 is a deficient number, since it is larger than the sum of its proper divisors (1452507).

2192421 is a wasteful number, since it uses less digits than its factorization.

2192421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512.

The product of its digits is 288, while the sum is 21.

The square root of 2192421 is about 1480.6826128512. The cubic root of 2192421 is about 129.9096216000.

2192421 divided by its sum of digits (21) gives a palindrome (104401).

It can be divided in two parts, 21924 and 21, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 2192421 in words is "two million, one hundred ninety-two thousand, four hundred twenty-one".