2021001001221 has 16 divisors (see below), whose sum is σ = 2696130857664. Its totient is φ = 1346602756224.

The previous prime is 2021001001219. The next prime is 2021001001259. The reversal of 2021001001221 is 1221001001202.

It is not a de Polignac number, because 2021001001221 - 2¹ = 2021001001219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021001001197 and 2021001001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001001121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55667551 + ... + 55703843.

It is an arithmetic number, because the mean of its divisors is an integer number (168508178604).

Almost surely, 2^{2021001001221} is an apocalyptic number.

It is an amenable number.

2021001001221 is a deficient number, since it is larger than the sum of its proper divisors (675129856443).

2021001001221 is a wasteful number, since it uses less digits than its factorization.

2021001001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45860.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2021001001221 its reverse (1221001001202), we get a palindrome (3242002002423).

The spelling of 2021001001221 in words is "two trillion, twenty-one billion, one million, one thousand, two hundred twenty-one".