121221019973 has 8 divisors (see below), whose sum is σ = 125153131776. Its totient is φ = 117290268000.

The previous prime is 121221019951. The next prime is 121221019979. The reversal of 121221019973 is 379910122121.

It is a happy number.

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 121221019973 - 2¹⁸ = 121220757829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221019979) 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, 157211 + ... + 516872.

It is an arithmetic number, because the mean of its divisors is an integer number (15644141472).

Almost surely, 2^121221019973 is an apocalyptic number.

It is an amenable number.

121221019973 is a deficient number, since it is larger than the sum of its proper divisors (3932111803).

121221019973 is an equidigital number, since it uses as much as digits as its factorization.

121221019973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679915.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 121221019973 in words is "one hundred twenty-one billion, two hundred twenty-one million, nineteen thousand, nine hundred seventy-three".