121028278 has 16 divisors (see below), whose sum is σ = 214170624. Its totient is φ = 50195880.

The previous prime is 121028261. The next prime is 121028279. The reversal of 121028278 is 872820121.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121028279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139000 + ... + 139867.

It is an arithmetic number, because the mean of its divisors is an integer number (13385664).

Almost surely, 2^121028278 is an apocalyptic number.

121028278 is a deficient number, since it is larger than the sum of its proper divisors (93142346).

121028278 is a wasteful number, since it uses less digits than its factorization.

121028278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278907.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 121028278 is about 11001.2852885470. The cubic root of 121028278 is about 494.6472717537.

Adding to 121028278 its reverse (872820121), we get a palindrome (993848399).

The spelling of 121028278 in words is "one hundred twenty-one million, twenty-eight thousand, two hundred seventy-eight".