2021145523 has 4 divisors (see below), whose sum is σ = 2021242768. Its totient is φ = 2021048280.

The previous prime is 2021145479. The next prime is 2021145541. The reversal of 2021145523 is 3255411202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021145523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021145563) 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, 3468 + ... + 63673.

It is an arithmetic number, because the mean of its divisors is an integer number (505310692).

Almost surely, 2^2021145523 is an apocalyptic number.

2021145523 is a deficient number, since it is larger than the sum of its proper divisors (97245).

2021145523 is an equidigital number, since it uses as much as digits as its factorization.

2021145523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97244.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2021145523 is about 44957.1520783957. The cubic root of 2021145523 is about 1264.3457740789.

Adding to 2021145523 its reverse (3255411202), we get a palindrome (5276556725).

The spelling of 2021145523 in words is "two billion, twenty-one million, one hundred forty-five thousand, five hundred twenty-three".