21212010002 has 4 divisors (see below), whose sum is σ = 31818015006. Its totient is φ = 10606005000.

The previous prime is 21212009993. The next prime is 21212010011. The reversal of 21212010002 is 20001021212.

It is a happy number.

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 (21212009993) and next prime (21212010011).

It can be written as a sum of positive squares in only one way, i.e., 19490672881 + 1721337121 = 139609^2 + 41489^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303002499 + ... + 5303002502.

Almost surely, 2^21212010002 is an apocalyptic number.

21212010002 is a deficient number, since it is larger than the sum of its proper divisors (10606005004).

21212010002 is a wasteful number, since it uses less digits than its factorization.

21212010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606005003.

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

Adding to 21212010002 its reverse (20001021212), we get a palindrome (41213031214).

The spelling of 21212010002 in words is "twenty-one billion, two hundred twelve million, ten thousand, two".