121564011 has 4 divisors (see below), whose sum is σ = 162085352. Its totient is φ = 81042672.

The previous prime is 121564007. The next prime is 121564021. The reversal of 121564011 is 110465121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121564011 - 2² = 121564007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121564021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20260666 + ... + 20260671.

It is an arithmetic number, because the mean of its divisors is an integer number (40521338).

Almost surely, 2^121564011 is an apocalyptic number.

121564011 is a deficient number, since it is larger than the sum of its proper divisors (40521341).

121564011 is an equidigital number, since it uses as much as digits as its factorization.

121564011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40521340.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 121564011 is about 11025.6070581170. The cubic root of 121564011 is about 495.3760513500.

The spelling of 121564011 in words is "one hundred twenty-one million, five hundred sixty-four thousand, eleven".