21221000101 has 8 divisors (see below), whose sum is σ = 24300791424. Its totient is φ = 18153263760.

The previous prime is 21221000083. The next prime is 21221000131. The reversal of 21221000101 is 10100012212.

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 21221000101 - 2⁷ = 21220999973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221000131) 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 7 ways as a sum of consecutive naturals, for example, 3009970 + ... + 3017011.

It is an arithmetic number, because the mean of its divisors is an integer number (3037598928).

Almost surely, 2^21221000101 is an apocalyptic number.

It is an amenable number.

21221000101 is a deficient number, since it is larger than the sum of its proper divisors (3079791323).

21221000101 is an equidigital number, since it uses as much as digits as its factorization.

21221000101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6027491.

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

Adding to 21221000101 its reverse (10100012212), we get a palindrome (31321012313).

It can be divided in two parts, 21 and 221000101, that added together give a palindrome (221000122).

The spelling of 21221000101 in words is "twenty-one billion, two hundred twenty-one million, one hundred one", and thus it is an aban number.