1021220023 has 4 divisors (see below), whose sum is σ = 1022259888. Its totient is φ = 1020180160.

The previous prime is 1021220021. The next prime is 1021220027. The reversal of 1021220023 is 3200221201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200221201 = 193 ⋅16581457.

It is a cyclic number.

It is not a de Polignac number, because 1021220023 - 2¹ = 1021220021 is a prime.

It is a super-2 number, since 2×1021220023² = 2085780670752241058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021219985 and 1021220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518458 + ... + 520423.

It is an arithmetic number, because the mean of its divisors is an integer number (255564972).

Almost surely, 2^1021220023 is an apocalyptic number.

1021220023 is a deficient number, since it is larger than the sum of its proper divisors (1039865).

1021220023 is an equidigital number, since it uses as much as digits as its factorization.

1021220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039864.

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

The square root of 1021220023 is about 31956.5333382706. The cubic root of 1021220023 is about 1007.0238904549.

Adding to 1021220023 its reverse (3200221201), we get a palindrome (4221441224).

The spelling of 1021220023 in words is "one billion, twenty-one million, two hundred twenty thousand, twenty-three".