1021356523 has 6 divisors (see below), whose sum is σ = 1122648212. Its totient is φ = 928505820.

The previous prime is 1021356521. The next prime is 1021356529. The reversal of 1021356523 is 3256531201.

It is not a de Polignac number, because 1021356523 - 2¹ = 1021356521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021356491 and 1021356500.

It is not an unprimeable number, because it can be changed into a prime (1021356521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4220361 + ... + 4220602.

Almost surely, 2^1021356523 is an apocalyptic number.

1021356523 is a deficient number, since it is larger than the sum of its proper divisors (101291689).

1021356523 is an equidigital number, since it uses as much as digits as its factorization.

1021356523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440985 (or 8440974 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1021356523 is about 31958.6689804191. The cubic root of 1021356523 is about 1007.0687559537.

Adding to 1021356523 its reverse (3256531201), we get a palindrome (4277887724).

The spelling of 1021356523 in words is "one billion, twenty-one million, three hundred fifty-six thousand, five hundred twenty-three".