1021040023 has 4 divisors (see below), whose sum is σ = 1023734440. Its totient is φ = 1018345608.

The previous prime is 1021039997. The next prime is 1021040029. The reversal of 1021040023 is 3200401201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200401201 = 17789 ⋅179909.

It is a cyclic number.

It is not a de Polignac number, because 1021040023 - 2⁵ = 1021039991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021039985 and 1021040012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021040029) 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, 1346640 + ... + 1347397.

It is an arithmetic number, because the mean of its divisors is an integer number (255933610).

Almost surely, 2^1021040023 is an apocalyptic number.

1021040023 is a deficient number, since it is larger than the sum of its proper divisors (2694417).

1021040023 is an equidigital number, since it uses as much as digits as its factorization.

1021040023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694416.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1021040023 is about 31953.7168886501. The cubic root of 1021040023 is about 1006.9647210474.

Adding to 1021040023 its reverse (3200401201), we get a palindrome (4221441224).

The spelling of 1021040023 in words is "one billion, twenty-one million, forty thousand, twenty-three".