2000020121221 has 4 divisors (see below), whose sum is σ = 2000143694592. Its totient is φ = 1999896547852.

The previous prime is 2000020121213. The next prime is 2000020121251. The reversal of 2000020121221 is 1221210200002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2000020121221 - 2³ = 2000020121213 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 (2000020121201) 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, 61762405 + ... + 61794778.

It is an arithmetic number, because the mean of its divisors is an integer number (500035923648).

Almost surely, 2^{2000020121221} is an apocalyptic number.

It is an amenable number.

2000020121221 is a deficient number, since it is larger than the sum of its proper divisors (123573371).

2000020121221 is a wasteful number, since it uses less digits than its factorization.

2000020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123573370.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2000020121221 its reverse (1221210200002), we get a palindrome (3221230321223).

The spelling of 2000020121221 in words is "two trillion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".