2021221504023 has 4 divisors (see below), whose sum is σ = 2694962005368. Its totient is φ = 1347481002680.

The previous prime is 2021221503943. The next prime is 2021221504033. The reversal of 2021221504023 is 3204051221202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021221504023 - 2¹⁶ = 2021221438487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021221503984 and 2021221504002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021221504033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336870250668 + ... + 336870250673.

It is an arithmetic number, because the mean of its divisors is an integer number (673740501342).

Almost surely, 2^{2021221504023} is an apocalyptic number.

2021221504023 is a deficient number, since it is larger than the sum of its proper divisors (673740501345).

2021221504023 is an equidigital number, since it uses as much as digits as its factorization.

2021221504023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673740501344.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 2021221504023 its reverse (3204051221202), we get a palindrome (5225272725225).

The spelling of 2021221504023 in words is "two trillion, twenty-one billion, two hundred twenty-one million, five hundred four thousand, twenty-three".