21221201022002 has 8 divisors (see below), whose sum is σ = 31841574892956. Its totient is φ = 10607342724352.

The previous prime is 21221201021963. The next prime is 21221201022037. The reversal of 21221201022002 is 20022010212212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20750493883441 + 470707138561 = 4555271^2 + 686081^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628885183 + ... + 1628898210.

Almost surely, 2^{21221201022002} is an apocalyptic number.

21221201022002 is a deficient number, since it is larger than the sum of its proper divisors (10620373870954).

21221201022002 is a wasteful number, since it uses less digits than its factorization.

21221201022002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257786652.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21221201022002 its reverse (20022010212212), we get a palindrome (41243211234214).

The spelling of 21221201022002 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, twenty-two thousand, two".