21000222001 has 8 divisors (see below), whose sum is σ = 22913712000. Its totient is φ = 19087461840.

The previous prime is 21000221989. The next prime is 21000222007. The reversal of 21000222001 is 10022200012.

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 21000222001 - 2²⁵ = 20966667569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000222007) 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, 121401 + ... + 238198.

It is an arithmetic number, because the mean of its divisors is an integer number (2864214000).

Almost surely, 2^21000222001 is an apocalyptic number.

It is an amenable number.

21000222001 is a deficient number, since it is larger than the sum of its proper divisors (1913489999).

21000222001 is a wasteful number, since it uses less digits than its factorization.

21000222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364919.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000222001 its reverse (10022200012), we get a palindrome (31022422013).

The spelling of 21000222001 in words is "twenty-one billion, two hundred twenty-two thousand, one".