21221100002 has 8 divisors (see below), whose sum is σ = 32508919296. Its totient is φ = 10384793572.

The previous prime is 21221099987. The next prime is 21221100007. The reversal of 21221100002 is 20000112212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21221100007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112878098 + ... + 112878285.

It is an arithmetic number, because the mean of its divisors is an integer number (4063614912).

Almost surely, 2^21221100002 is an apocalyptic number.

21221100002 is a deficient number, since it is larger than the sum of its proper divisors (11287819294).

21221100002 is a wasteful number, since it uses less digits than its factorization.

21221100002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225756432.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21221100002 its reverse (20000112212), we get a palindrome (41221212214).

The spelling of 21221100002 in words is "twenty-one billion, two hundred twenty-one million, one hundred thousand, two".