21213220001 has 8 divisors (see below), whose sum is σ = 21327618144. Its totient is φ = 21098868480.

The previous prime is 21213219991. The next prime is 21213220003. The reversal of 21213220001 is 10002231212.

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 a de Polignac number, because none of the positive numbers 2^k-21213220001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213220003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1283150 + ... + 1299576.

It is an arithmetic number, because the mean of its divisors is an integer number (2665952268).

Almost surely, 2^21213220001 is an apocalyptic number.

It is an amenable number.

21213220001 is a deficient number, since it is larger than the sum of its proper divisors (114398143).

21213220001 is a wasteful number, since it uses less digits than its factorization.

21213220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23311.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21213220001 its reverse (10002231212), we get a palindrome (31215451213).

The spelling of 21213220001 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty thousand, one".