20502121 has 4 divisors (see below), whose sum is σ = 21581200. Its totient is φ = 19423044.

The previous prime is 20502113. The next prime is 20502133. The reversal of 20502121 is 12120502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20502121 - 2³ = 20502113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20502151) 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 3 ways as a sum of consecutive naturals, for example, 539511 + ... + 539548.

It is an arithmetic number, because the mean of its divisors is an integer number (5395300).

Almost surely, 2^20502121 is an apocalyptic number.

It is an amenable number.

20502121 is a deficient number, since it is larger than the sum of its proper divisors (1079079).

20502121 is a wasteful number, since it uses less digits than its factorization.

20502121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079078.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20502121 is about 4527.9267882774. The cubic root of 20502121 is about 273.6946222156.

Adding to 20502121 its reverse (12120502), we get a palindrome (32622623).

The spelling of 20502121 in words is "twenty million, five hundred two thousand, one hundred twenty-one".