1021220100013 has 4 divisors (see below), whose sum is σ = 1081291870620. Its totient is φ = 961148329408.

The previous prime is 1021220099989. The next prime is 1021220100053. The reversal of 1021220100013 is 3100010221201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 910035865764 + 111184234249 = 953958^2 + 333443^2 .

It is not a de Polignac number, because 1021220100013 - 2¹³ = 1021220091821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021220099966 and 1021220100002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021220100053) 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, 30035885278 + ... + 30035885311.

It is an arithmetic number, because the mean of its divisors is an integer number (270322967655).

Almost surely, 2^{1021220100013} is an apocalyptic number.

It is an amenable number.

1021220100013 is a deficient number, since it is larger than the sum of its proper divisors (60071770607).

1021220100013 is an equidigital number, since it uses as much as digits as its factorization.

1021220100013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60071770606.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1021220100013 its reverse (3100010221201), we get a palindrome (4121230321214).

The spelling of 1021220100013 in words is "one trillion, twenty-one billion, two hundred twenty million, one hundred thousand, thirteen".