121400144 has 10 divisors (see below), whose sum is σ = 235212810. Its totient is φ = 60700064.

The previous prime is 121400129. The next prime is 121400161. The reversal of 121400144 is 441004121.

It can be written as a sum of positive squares in only one way, i.e., 100240144 + 21160000 = 10012^2 + 4600^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3793739 + ... + 3793770.

It is an arithmetic number, because the mean of its divisors is an integer number (23521281).

Almost surely, 2^121400144 is an apocalyptic number.

It is an amenable number.

121400144 is a deficient number, since it is larger than the sum of its proper divisors (113812666).

121400144 is an equidigital number, since it uses as much as digits as its factorization.

121400144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7587517 (or 7587511 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 121400144 is about 11018.1733513319. The cubic root of 121400144 is about 495.1533640355.

Adding to 121400144 its reverse (441004121), we get a palindrome (562404265).

The spelling of 121400144 in words is "one hundred twenty-one million, four hundred thousand, one hundred forty-four".