20421141 has 16 divisors (see below), whose sum is σ = 29405376. Its totient is φ = 12531456.

The previous prime is 20421103. The next prime is 20421179. The reversal of 20421141 is 14112402.

It is an interprime number because it is at equal distance from previous prime (20421103) and next prime (20421179).

It is not a de Polignac number, because 20421141 - 2⁷ = 20421013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20421141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22686 + ... + 23568.

It is an arithmetic number, because the mean of its divisors is an integer number (1837836).

Almost surely, 2^20421141 is an apocalyptic number.

It is an amenable number.

20421141 is a deficient number, since it is larger than the sum of its proper divisors (8984235).

20421141 is a wasteful number, since it uses less digits than its factorization.

20421141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20421141 is about 4518.9756582659. The cubic root of 20421141 is about 273.3337971768. Note that the first 3 decimals are identical.

Adding to 20421141 its reverse (14112402), we get a palindrome (34533543).

The spelling of 20421141 in words is "twenty million, four hundred twenty-one thousand, one hundred forty-one".