21221322001 has 8 divisors (see below), whose sum is σ = 23200111584. Its totient is φ = 19250795520.

The previous prime is 21221321987. The next prime is 21221322011. The reversal of 21221322001 is 10022312212.

It is a happy number.

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

It is not a de Polignac number, because 21221322001 - 2¹¹ = 21221319953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221322011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2060400 + ... + 2070673.

It is an arithmetic number, because the mean of its divisors is an integer number (2900013948).

Almost surely, 2^21221322001 is an apocalyptic number.

It is an amenable number.

21221322001 is a deficient number, since it is larger than the sum of its proper divisors (1978789583).

21221322001 is a wasteful number, since it uses less digits than its factorization.

21221322001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131551.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221322001 its reverse (10022312212), we get a palindrome (31243634213).

The spelling of 21221322001 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, one".