21001220302113 has 12 divisors (see below), whose sum is σ = 31313647475968. Its totient is φ = 13549174388280.

The previous prime is 21001220302109. The next prime is 21001220302133. The reversal of 21001220302113 is 31120302210012.

It is not a de Polignac number, because 21001220302113 - 2² = 21001220302109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001220302133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37636595245 + ... + 37636595802.

Almost surely, 2^{21001220302113} is an apocalyptic number.

It is an amenable number.

21001220302113 is a deficient number, since it is larger than the sum of its proper divisors (10312427173855).

21001220302113 is a wasteful number, since it uses less digits than its factorization.

21001220302113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75273191084 (or 75273191081 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21001220302113 its reverse (31120302210012), we get a palindrome (52121522512125).

The spelling of 21001220302113 in words is "twenty-one trillion, one billion, two hundred twenty million, three hundred two thousand, one hundred thirteen".