21200020001 has 8 divisors (see below), whose sum is σ = 21507902784. Its totient is φ = 20892395440.

The previous prime is 21200019961. The next prime is 21200020021. The reversal of 21200020001 is 10002000212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200020001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200020021) 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, 104006 + ... + 230688.

It is an arithmetic number, because the mean of its divisors is an integer number (2688487848).

Almost surely, 2^21200020001 is an apocalyptic number.

It is an amenable number.

21200020001 is a deficient number, since it is larger than the sum of its proper divisors (307882783).

21200020001 is a wasteful number, since it uses less digits than its factorization.

21200020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129111.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21200020001 its reverse (10002000212), we get a palindrome (31202020213).

The spelling of 21200020001 in words is "twenty-one billion, two hundred million, twenty thousand, one".