21223001001 has 8 divisors (see below), whose sum is σ = 28298826144. Its totient is φ = 14147921600.

The previous prime is 21223000999. The next prime is 21223001017. The reversal of 21223001001 is 10010032212.

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 21223001001 - 2¹ = 21223000999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21223001021) 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, 116256 + ... + 236561.

It is an arithmetic number, because the mean of its divisors is an integer number (3537353268).

Almost surely, 2^21223001001 is an apocalyptic number.

It is an amenable number.

21223001001 is a deficient number, since it is larger than the sum of its proper divisors (7075825143).

21223001001 is a wasteful number, since it uses less digits than its factorization.

21223001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372871.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21223001001 its reverse (10010032212), we get a palindrome (31233033213).

The spelling of 21223001001 in words is "twenty-one billion, two hundred twenty-three million, one thousand, one".