20241921 has 8 divisors (see below), whose sum is σ = 30844864. Its totient is φ = 11566800.

The previous prime is 20241899. The next prime is 20241929. The reversal of 20241921 is 12914202.

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

It is not a de Polignac number, because 20241921 - 2¹⁵ = 20209153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 963901 = 20241921 / (2 + 0 + 2 + 4 + 1 + 9 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20241929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481930 + ... + 481971.

It is an arithmetic number, because the mean of its divisors is an integer number (3855608).

Almost surely, 2^20241921 is an apocalyptic number.

20241921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20241921 is a deficient number, since it is larger than the sum of its proper divisors (10602943).

20241921 is an equidigital number, since it uses as much as digits as its factorization.

20241921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963911.

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

The square root of 20241921 is about 4499.1022437815. The cubic root of 20241921 is about 272.5318359124.

The spelling of 20241921 in words is "twenty million, two hundred forty-one thousand, nine hundred twenty-one".