2121121009973 has 6 divisors (see below), whose sum is σ = 2467426481046. Its totient is φ = 1818103722792.

The previous prime is 2121121009963. The next prime is 2121121010003. The reversal of 2121121009973 is 3799001211212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1962862644484 + 158258365489 = 1401022^2 + 397817^2 .

It is not a de Polignac number, because 2121121009973 - 2¹² = 2121121005877 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 (2121121009913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21644091890 + ... + 21644091987.

It is an arithmetic number, because the mean of its divisors is an integer number (411237746841).

Almost surely, 2^{2121121009973} is an apocalyptic number.

It is an amenable number.

2121121009973 is a deficient number, since it is larger than the sum of its proper divisors (346305471073).

2121121009973 is an equidigital number, since it uses as much as digits as its factorization.

2121121009973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43288183891 (or 43288183884 counting only the distinct ones).

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

The spelling of 2121121009973 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, nine thousand, nine hundred seventy-three".