21220111002 has 8 divisors (see below), whose sum is σ = 42440222016. Its totient is φ = 7073370332.

The previous prime is 21220110971. The next prime is 21220111027. The reversal of 21220111002 is 20011102212.

It is a sphenic number, since it is the product of 3 distinct primes.

21220111002 is an admirable number.

It is a super-2 number, since 2×21220111002² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768342578 + ... + 1768342589.

It is an arithmetic number, because the mean of its divisors is an integer number (5305027752).

Almost surely, 2^21220111002 is an apocalyptic number.

21220111002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220111002 is a wasteful number, since it uses less digits than its factorization.

21220111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536685172.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21220111002 its reverse (20011102212), we get a palindrome (41231213214).

The spelling of 21220111002 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, two".