21221102002 has 8 divisors (see below), whose sum is σ = 32929296300. Its totient is φ = 10244669904.

The previous prime is 21221101963. The next prime is 21221102087. The reversal of 21221102002 is 20020112212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21016010961 + 205091041 = 144969^2 + 14321^2 .

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

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, 182940477 + ... + 182940592.

Almost surely, 2^21221102002 is an apocalyptic number.

21221102002 is a deficient number, since it is larger than the sum of its proper divisors (11708194298).

21221102002 is a wasteful number, since it uses less digits than its factorization.

21221102002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365881100.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21221102002 its reverse (20020112212), we get a palindrome (41241214214).

The spelling of 21221102002 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, two".