21002341601 has 6 divisors (see below), whose sum is σ = 21955189410. Its totient is φ = 20089195808.

The previous prime is 21002341589. The next prime is 21002341609. The reversal of 21002341601 is 10614320012.

It can be written as a sum of positive squares in only one way, i.e., 20413551376 + 588790225 = 142876^2 + 24265^2 .

It is not a de Polignac number, because 21002341601 - 2²² = 20998147297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002341609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19850456 + ... + 19851513.

It is an arithmetic number, because the mean of its divisors is an integer number (3659198235).

Almost surely, 2^21002341601 is an apocalyptic number.

It is an amenable number.

21002341601 is a deficient number, since it is larger than the sum of its proper divisors (952847809).

21002341601 is an equidigital number, since it uses as much as digits as its factorization.

21002341601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39702015 (or 39701992 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21002341601 its reverse (10614320012), we get a palindrome (31616661613).

The spelling of 21002341601 in words is "twenty-one billion, two million, three hundred forty-one thousand, six hundred one".