2021553241531 has 4 divisors (see below), whose sum is σ = 2109446860752. Its totient is φ = 1933659622312.

The previous prime is 2021553241507. The next prime is 2021553241573. The reversal of 2021553241531 is 1351423551202.

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 2021553241531 - 2⁷ = 2021553241403 is a prime.

It is a super-2 number, since 2×2021553241531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021553241031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43946809576 + ... + 43946809621.

It is an arithmetic number, because the mean of its divisors is an integer number (527361715188).

Almost surely, 2^{2021553241531} is an apocalyptic number.

2021553241531 is a deficient number, since it is larger than the sum of its proper divisors (87893619221).

2021553241531 is an equidigital number, since it uses as much as digits as its factorization.

2021553241531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87893619220.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 2021553241531 its reverse (1351423551202), we get a palindrome (3372976792733).

The spelling of 2021553241531 in words is "two trillion, twenty-one billion, five hundred fifty-three million, two hundred forty-one thousand, five hundred thirty-one".