21221201002 has 8 divisors (see below), whose sum is σ = 31837867812. Its totient is φ = 10608578400.

The previous prime is 21221200991. The next prime is 21221201021. The reversal of 21221201002 is 20010212212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16243757401 + 4977443601 = 127451^2 + 70551^2 .

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997899 + ... + 1018942.

Almost surely, 2^21221201002 is an apocalyptic number.

21221201002 is a deficient number, since it is larger than the sum of its proper divisors (10616666810).

21221201002 is a wasteful number, since it uses less digits than its factorization.

21221201002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022104.

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

Adding to 21221201002 its reverse (20010212212), we get a palindrome (41231413214).

The spelling of 21221201002 in words is "twenty-one billion, two hundred twenty-one million, two hundred one thousand, two".