1013320021 has 4 divisors (see below), whose sum is σ = 1158080032. Its totient is φ = 868560012.

The previous prime is 1013319991. The next prime is 1013320031. The reversal of 1013320021 is 1200233101.

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: 1200233101 = 7541 ⋅159161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013320021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013319983 and 1013320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013320031) 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, 72379995 + ... + 72380008.

It is an arithmetic number, because the mean of its divisors is an integer number (289520008).

Almost surely, 2^1013320021 is an apocalyptic number.

It is an amenable number.

1013320021 is a deficient number, since it is larger than the sum of its proper divisors (144760011).

1013320021 is an equidigital number, since it uses as much as digits as its factorization.

1013320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144760010.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1013320021 is about 31832.6879323754. The cubic root of 1013320021 is about 1004.4204379363.

Adding to 1013320021 its reverse (1200233101), we get a palindrome (2213553122).

The spelling of 1013320021 in words is "one billion, thirteen million, three hundred twenty thousand, twenty-one".