2021552111531 has 4 divisors (see below), whose sum is σ = 2021849274312. Its totient is φ = 2021254948752.

The previous prime is 2021552111503. The next prime is 2021552111539. The reversal of 2021552111531 is 1351112551202.

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 2021552111531 - 2²² = 2021547917227 is a prime.

It is a super-2 number, since 2×2021552111531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021552111494 and 2021552111503.

It is not an unprimeable number, because it can be changed into a prime (2021552111539) 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, 148571186 + ... + 148584791.

It is an arithmetic number, because the mean of its divisors is an integer number (505462318578).

Almost surely, 2^{2021552111531} is an apocalyptic number.

2021552111531 is a deficient number, since it is larger than the sum of its proper divisors (297162781).

2021552111531 is an equidigital number, since it uses as much as digits as its factorization.

2021552111531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297162780.

The product of its (nonzero) digits is 3000, while the sum is 29.

Adding to 2021552111531 its reverse (1351112551202), we get a palindrome (3372664662733).

The spelling of 2021552111531 in words is "two trillion, twenty-one billion, five hundred fifty-two million, one hundred eleven thousand, five hundred thirty-one".