21212222002 has 4 divisors (see below), whose sum is σ = 31818333006. Its totient is φ = 10606111000.

The previous prime is 21212221993. The next prime is 21212222011. The reversal of 21212222002 is 20022221212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21212221993) and next prime (21212222011).

It can be written as a sum of positive squares in only one way, i.e., 21169959001 + 42263001 = 145499^2 + 6501^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303055499 + ... + 5303055502.

Almost surely, 2^21212222002 is an apocalyptic number.

21212222002 is a deficient number, since it is larger than the sum of its proper divisors (10606111004).

21212222002 is a wasteful number, since it uses less digits than its factorization.

21212222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606111003.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21212222002 its reverse (20022221212), we get a palindrome (41234443214).

The spelling of 21212222002 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two".