21221110102 has 8 divisors (see below), whose sum is σ = 31833370800. Its totient is φ = 10609986504.

The previous prime is 21221110067. The next prime is 21221110187. The reversal of 21221110102 is 20101112212.

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

It is a super-2 number, since 2×21221110102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 235977 + ... + 313252.

It is an arithmetic number, because the mean of its divisors is an integer number (3979171350).

Almost surely, 2^21221110102 is an apocalyptic number.

21221110102 is a deficient number, since it is larger than the sum of its proper divisors (10612260698).

21221110102 is a wasteful number, since it uses less digits than its factorization.

21221110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568550.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221110102 its reverse (20101112212), we get a palindrome (41322222314).

The spelling of 21221110102 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred two".