121021265 has 8 divisors (see below), whose sum is σ = 149150760. Its totient is φ = 94200192.

The previous prime is 121021261. The next prime is 121021267. The reversal of 121021265 is 562120121.

It can be written as a sum of positive squares in 4 ways, for example, as 10182481 + 110838784 = 3191^2 + 10528^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121021265 - 2² = 121021261 is a prime.

It is a super-2 number, since 2×121021265² = 29292293164400450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121021261) 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, 326900 + ... + 327269.

It is an arithmetic number, because the mean of its divisors is an integer number (18643845).

Almost surely, 2^121021265 is an apocalyptic number.

It is an amenable number.

121021265 is a deficient number, since it is larger than the sum of its proper divisors (28129495).

121021265 is an equidigital number, since it uses as much as digits as its factorization.

121021265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654211.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 121021265 is about 11000.9665484447. The cubic root of 121021265 is about 494.6377174347.

Adding to 121021265 its reverse (562120121), we get a palindrome (683141386).

The spelling of 121021265 in words is "one hundred twenty-one million, twenty-one thousand, two hundred sixty-five".