1013200021 has 4 divisors (see below), whose sum is σ = 1015961152. Its totient is φ = 1010438892.

The previous prime is 1013199997. The next prime is 1013200037. The reversal of 1013200021 is 1200023101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200023101 = 1559 ⋅769739.

It is a cyclic number.

It is not a de Polignac number, because 1013200021 - 2⁷ = 1013199893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013199980 and 1013200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013200081) 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, 1380015 + ... + 1380748.

It is an arithmetic number, because the mean of its divisors is an integer number (253990288).

Almost surely, 2^1013200021 is an apocalyptic number.

It is an amenable number.

1013200021 is a deficient number, since it is larger than the sum of its proper divisors (2761131).

1013200021 is an equidigital number, since it uses as much as digits as its factorization.

1013200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761130.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1013200021 is about 31830.8030216016. The cubic root of 1013200021 is about 1004.3807876750.

Adding to 1013200021 its reverse (1200023101), we get a palindrome (2213223122).

The spelling of 1013200021 in words is "one billion, thirteen million, two hundred thousand, twenty-one".