21221200001 has 8 divisors (see below), whose sum is σ = 21396049920. Its totient is φ = 21046471488.

The previous prime is 21221199973. The next prime is 21221200027. The reversal of 21221200001 is 10000212212.

It is a happy number.

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 21221200001 - 2¹⁴ = 21221183617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221200061) 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, 339080 + ... + 396758.

It is an arithmetic number, because the mean of its divisors is an integer number (2674506240).

Almost surely, 2^21221200001 is an apocalyptic number.

It is an amenable number.

21221200001 is a deficient number, since it is larger than the sum of its proper divisors (174849919).

21221200001 is a wasteful number, since it uses less digits than its factorization.

21221200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60703.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21221200001 its reverse (10000212212), we get a palindrome (31221412213).

The spelling of 21221200001 in words is "twenty-one billion, two hundred twenty-one million, two hundred thousand, one".