121641428 has 12 divisors (see below), whose sum is σ = 220213140. Its totient is φ = 58723392.

The previous prime is 121641407. The next prime is 121641431. The reversal of 121641428 is 824146121.

It can be written as a sum of positive squares in 2 ways, for example, as 35188624 + 86452804 = 5932^2 + 9298^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 121641428.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 524201 + ... + 524432.

It is an arithmetic number, because the mean of its divisors is an integer number (18351095).

Almost surely, 2^121641428 is an apocalyptic number.

It is an amenable number.

121641428 is a deficient number, since it is larger than the sum of its proper divisors (98571712).

121641428 is a wasteful number, since it uses less digits than its factorization.

121641428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048666 (or 1048664 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 121641428 is about 11029.1172810883. The cubic root of 121641428 is about 495.4811877010.

Adding to 121641428 its reverse (824146121), we get a palindrome (945787549).

The spelling of 121641428 in words is "one hundred twenty-one million, six hundred forty-one thousand, four hundred twenty-eight".