20125221 has 8 divisors (see below), whose sum is σ = 26893440. Its totient is φ = 13386912.

The previous prime is 20125177. The next prime is 20125241. The reversal of 20125221 is 12252102.

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

It is not a de Polignac number, because 20125221 - 2¹⁰ = 20124197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20125221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125241) 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, 5856 + ... + 8633.

It is an arithmetic number, because the mean of its divisors is an integer number (3361680).

Almost surely, 2^20125221 is an apocalyptic number.

It is an amenable number.

20125221 is a deficient number, since it is larger than the sum of its proper divisors (6768219).

20125221 is a wasteful number, since it uses less digits than its factorization.

20125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14955.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20125221 is about 4486.1142428610. The cubic root of 20125221 is about 272.0070869333.

Adding to 20125221 its reverse (12252102), we get a palindrome (32377323).

The spelling of 20125221 in words is "twenty million, one hundred twenty-five thousand, two hundred twenty-one".