21130020001 has 8 divisors (see below), whose sum is σ = 22376259720. Its totient is φ = 19884146688.

The previous prime is 21130019941. The next prime is 21130020013. The reversal of 21130020001 is 10002003112.

It can be written as a sum of positive squares in 4 ways, for example, as 15085734976 + 6044285025 = 122824^2 + 77745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21130020001 - 2¹³ = 21130011809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130020001.

It is not an unprimeable number, because it can be changed into a prime (21130020071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31905 + ... + 208033.

It is an arithmetic number, because the mean of its divisors is an integer number (2797032465).

Almost surely, 2^21130020001 is an apocalyptic number.

It is an amenable number.

21130020001 is a deficient number, since it is larger than the sum of its proper divisors (1246239719).

21130020001 is a wasteful number, since it uses less digits than its factorization.

21130020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183203.

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

Adding to 21130020001 its reverse (10002003112), we get a palindrome (31132023113).

The spelling of 21130020001 in words is "twenty-one billion, one hundred thirty million, twenty thousand, one".