21220100001 has 12 divisors (see below), whose sum is σ = 30655531920. Its totient is φ = 14144759640.

The previous prime is 21220099991. The next prime is 21220100021. The reversal of 21220100001 is 10000102212.

It is not a de Polignac number, because 21220100001 - 2⁵ = 21220099969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21220100021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94831 + ... + 226788.

It is an arithmetic number, because the mean of its divisors is an integer number (2554627660).

Almost surely, 2^21220100001 is an apocalyptic number.

It is an amenable number.

21220100001 is a deficient number, since it is larger than the sum of its proper divisors (9435431919).

21220100001 is a wasteful number, since it uses less digits than its factorization.

21220100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328956 (or 328953 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21220100001 its reverse (10000102212), we get a palindrome (31220202213).

The spelling of 21220100001 in words is "twenty-one billion, two hundred twenty million, one hundred thousand, one".