21201010001 has 8 divisors (see below), whose sum is σ = 21713068608. Its totient is φ = 20694258000.

The previous prime is 21201009997. The next prime is 21201010003. The reversal of 21201010001 is 10001010212.

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 21201010001 - 2² = 21201009997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201010003) 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, 1318565 + ... + 1334546.

It is an arithmetic number, because the mean of its divisors is an integer number (2714133576).

Almost surely, 2^21201010001 is an apocalyptic number.

It is an amenable number.

21201010001 is a deficient number, since it is larger than the sum of its proper divisors (512058607).

21201010001 is a wasteful number, since it uses less digits than its factorization.

21201010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653303.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21201010001 its reverse (10001010212), we get a palindrome (31202020213).

The spelling of 21201010001 in words is "twenty-one billion, two hundred one million, ten thousand, one".