121101210128 has 10 divisors (see below), whose sum is σ = 234633594654. Its totient is φ = 60550605056.

The previous prime is 121101210127. The next prime is 121101210163. The reversal of 121101210128 is 821012101121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 93081128464 + 28020081664 = 305092^2 + 167392^2 .

It is not an unprimeable number, because it can be changed into a prime (121101210121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3784412801 + ... + 3784412832.

Almost surely, 2^121101210128 is an apocalyptic number.

It is an amenable number.

121101210128 is a deficient number, since it is larger than the sum of its proper divisors (113532384526).

121101210128 is an equidigital number, since it uses as much as digits as its factorization.

121101210128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7568825641 (or 7568825635 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121101210128 its reverse (821012101121), we get a palindrome (942113311249).

The spelling of 121101210128 in words is "one hundred twenty-one billion, one hundred one million, two hundred ten thousand, one hundred twenty-eight".