21212212202010 has 96 divisors (see below), whose sum is σ = 55202444049168. Its totient is φ = 5651392158720.

The previous prime is 21212212201991. The next prime is 21212212202029. The reversal of 21212212202010 is 1020221221212.

It is a happy number.

21212212202010 is a `hidden beast` number, since 2 + 1 + 21 + 221 + 220 + 201 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21212212201991) and next prime (21212212202029).

It can be written as a sum of positive squares in 8 ways, for example, as 10490078067921 + 10722134134089 = 3238839^2 + 3274467^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1062034384 + ... + 1062054356.

Almost surely, 2^{21212212202010} is an apocalyptic number.

21212212202010 is an abundant number, since it is smaller than the sum of its proper divisors (33990231847158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212212202010 is a wasteful number, since it uses less digits than its factorization.

21212212202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30240 (or 30237 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21212212202010 its reverse (1020221221212), we get a palindrome (22232433423222).

The spelling of 21212212202010 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, two hundred two thousand, ten".