121021306 has 32 divisors (see below), whose sum is σ = 210607488. Its totient is φ = 51088320.

The previous prime is 121021301. The next prime is 121021319. The reversal of 121021306 is 603120121.

It is a self number, because there is not a number n which added to its sum of digits gives 121021306.

It is not an unprimeable number, because it can be changed into a prime (121021301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412896 + ... + 413188.

It is an arithmetic number, because the mean of its divisors is an integer number (6581484).

Almost surely, 2^121021306 is an apocalyptic number.

121021306 is a deficient number, since it is larger than the sum of its proper divisors (89586182).

121021306 is a wasteful number, since it uses less digits than its factorization.

121021306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 121021306 is about 11000.9684119172. The cubic root of 121021306 is about 494.6377732930.

Adding to 121021306 its reverse (603120121), we get a palindrome (724141427).

The spelling of 121021306 in words is "one hundred twenty-one million, twenty-one thousand, three hundred six".