21221002202 has 8 divisors (see below), whose sum is σ = 32353331412. Its totient is φ = 10436558400.

The previous prime is 21221002193. The next prime is 21221002217. The reversal of 21221002202 is 20220012212.

It can be written as a sum of positive squares in 2 ways, for example, as 15737451601 + 5483550601 = 125449^2 + 74051^2 .

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, 86971199 + ... + 86971442.

Almost surely, 2^21221002202 is an apocalyptic number.

21221002202 is a deficient number, since it is larger than the sum of its proper divisors (11132329210).

21221002202 is a wasteful number, since it uses less digits than its factorization.

21221002202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173942704.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21221002202 its reverse (20220012212), we get a palindrome (41441014414).

The spelling of 21221002202 in words is "twenty-one billion, two hundred twenty-one million, two thousand, two hundred two".