1021200023 has 4 divisors (see below), whose sum is σ = 1065600048. Its totient is φ = 976800000.

The previous prime is 1021200017. The next prime is 1021200031. The reversal of 1021200023 is 3200021201.

It is a happy number.

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 1021200023 - 2²⁸ = 752764567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021199977 and 1021200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021280023) 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, 22199978 + ... + 22200023.

It is an arithmetic number, because the mean of its divisors is an integer number (266400012).

Almost surely, 2^1021200023 is an apocalyptic number.

1021200023 is a deficient number, since it is larger than the sum of its proper divisors (44400025).

1021200023 is an equidigital number, since it uses as much as digits as its factorization.

1021200023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44400024.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1021200023 is about 31956.2204116820. The cubic root of 1021200023 is about 1007.0173164197.

Adding to 1021200023 its reverse (3200021201), we get a palindrome (4221221224).

The spelling of 1021200023 in words is "one billion, twenty-one million, two hundred thousand, twenty-three".