1011021023 has 4 divisors (see below), whose sum is σ = 1011206448. Its totient is φ = 1010835600.

The previous prime is 1011021013. The next prime is 1011021047. The reversal of 1011021023 is 3201201101.

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 1011021023 - 2⁴ = 1011021007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011020995 and 1011021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011021013) 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, 84278 + ... + 95523.

It is an arithmetic number, because the mean of its divisors is an integer number (252801612).

Almost surely, 2^1011021023 is an apocalyptic number.

1011021023 is a deficient number, since it is larger than the sum of its proper divisors (185425).

1011021023 is an equidigital number, since it uses as much as digits as its factorization.

1011021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185424.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1011021023 is about 31796.5567789973. The cubic root of 1011021023 is about 1003.6602604804.

Adding to 1011021023 its reverse (3201201101), we get a palindrome (4212222124).

The spelling of 1011021023 in words is "one billion, eleven million, twenty-one thousand, twenty-three".