21221032102 has 8 divisors (see below), whose sum is σ = 33703992216. Its totient is φ = 9986368032.

The previous prime is 21221032097. The next prime is 21221032111. The reversal of 21221032102 is 20123012212.

It is a happy number.

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

It is a super-2 number, since 2×21221032102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312073968 + ... + 312074035.

It is an arithmetic number, because the mean of its divisors is an integer number (4212999027).

Almost surely, 2^21221032102 is an apocalyptic number.

21221032102 is a deficient number, since it is larger than the sum of its proper divisors (12482960114).

21221032102 is a wasteful number, since it uses less digits than its factorization.

21221032102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624148022.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221032102 its reverse (20123012212), we get a palindrome (41344044314).

The spelling of 21221032102 in words is "twenty-one billion, two hundred twenty-one million, thirty-two thousand, one hundred two".