20021542221213 has 48 divisors (see below), whose sum is σ = 31203186094080. Its totient is φ = 12297785939712.

The previous prime is 20021542221211. The next prime is 20021542221277. The reversal of 20021542221213 is 31212224512002.

20021542221213 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 1 + 5 + 422 + 21 + 213 = 666.

It is not a de Polignac number, because 20021542221213 - 2¹ = 20021542221211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021542221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 808383556 + ... + 808408322.

It is an arithmetic number, because the mean of its divisors is an integer number (650066376960).

Almost surely, 2^{20021542221213} is an apocalyptic number.

It is an amenable number.

20021542221213 is a deficient number, since it is larger than the sum of its proper divisors (11181643872867).

20021542221213 is a wasteful number, since it uses less digits than its factorization.

20021542221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37498 (or 37495 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 20021542221213 its reverse (31212224512002), we get a palindrome (51233766733215).

The spelling of 20021542221213 in words is "twenty trillion, twenty-one billion, five hundred forty-two million, two hundred twenty-one thousand, two hundred thirteen".