121221100019 has 8 divisors (see below), whose sum is σ = 121423698000. Its totient is φ = 121018559872.

The previous prime is 121221100003. The next prime is 121221100067. The reversal of 121221100019 is 910001122121.

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 121221100019 - 2⁴ = 121221100003 is a prime.

It is a super-2 number, since 2×121221100019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221100069) 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, 6692327 + ... + 6710415.

It is an arithmetic number, because the mean of its divisors is an integer number (15177962250).

Almost surely, 2^121221100019 is an apocalyptic number.

121221100019 is a deficient number, since it is larger than the sum of its proper divisors (202597981).

121221100019 is a wasteful number, since it uses less digits than its factorization.

121221100019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28917.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121221100019 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, nineteen".