21212202010 has 16 divisors (see below), whose sum is σ = 38751844896. Its totient is φ = 8358240528.

The previous prime is 21212201963. The next prime is 21212202041. The reversal of 21212202010 is 1020221212.

It is a happy number.

It is a super-2 number, since 2×21212202010² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15829332 + ... + 15830671.

It is an arithmetic number, because the mean of its divisors is an integer number (2421990306).

Almost surely, 2^21212202010 is an apocalyptic number.

21212202010 is a deficient number, since it is larger than the sum of its proper divisors (17539642886).

21212202010 is a wasteful number, since it uses less digits than its factorization.

21212202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31660077.

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

Adding to 21212202010 its reverse (1020221212), we get a palindrome (22232423222).

The spelling of 21212202010 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand, ten".