2000121997 has 4 divisors (see below), whose sum is σ = 2001542940. Its totient is φ = 1998701056.

The previous prime is 2000121979. The next prime is 2000122037. The reversal of 2000121997 is 7991210002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7991210002 = 2 ⋅3995605001.

It can be written as a sum of positive squares in 2 ways, for example, as 461992036 + 1538129961 = 21494^2 + 39219^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000121997 - 2¹⁹ = 1999597709 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 (2000121917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708358 + ... + 711175.

It is an arithmetic number, because the mean of its divisors is an integer number (500385735).

Almost surely, 2^2000121997 is an apocalyptic number.

It is an amenable number.

2000121997 is a deficient number, since it is larger than the sum of its proper divisors (1420943).

2000121997 is a wasteful number, since it uses less digits than its factorization.

2000121997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420942.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 2000121997 is about 44722.7234971217. The cubic root of 2000121997 is about 1259.9466671387.

Adding to 2000121997 its reverse (7991210002), we get a palindrome (9991331999).

The spelling of 2000121997 in words is "two billion, one hundred twenty-one thousand, nine hundred ninety-seven".