21220010101 has 4 divisors (see below), whose sum is σ = 21713498752. Its totient is φ = 20726521452.

The previous prime is 21220010089. The next prime is 21220010107. The reversal of 21220010101 is 10101002212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21220010101 - 2⁵ = 21220010069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220010107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246744261 + ... + 246744346.

It is an arithmetic number, because the mean of its divisors is an integer number (5428374688).

Almost surely, 2^21220010101 is an apocalyptic number.

It is an amenable number.

21220010101 is a deficient number, since it is larger than the sum of its proper divisors (493488651).

21220010101 is an equidigital number, since it uses as much as digits as its factorization.

21220010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493488650.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21220010101 its reverse (10101002212), we get a palindrome (31321012313).

The spelling of 21220010101 in words is "twenty-one billion, two hundred twenty million, ten thousand, one hundred one".