21212112010 has 8 divisors (see below), whose sum is σ = 38181801636. Its totient is φ = 8484844800.

The previous prime is 21212112007. The next prime is 21212112023. The reversal of 21212112010 is 1021121212.

It can be written as a sum of positive squares in 2 ways, for example, as 20532310681 + 679801329 = 143291^2 + 26073^2 .

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, 1060605591 + ... + 1060605610.

Almost surely, 2^21212112010 is an apocalyptic number.

21212112010 is a deficient number, since it is larger than the sum of its proper divisors (16969689626).

21212112010 is a wasteful number, since it uses less digits than its factorization.

21212112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121211208.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212112010 its reverse (1021121212), we get a palindrome (22233233222).

The spelling of 21212112010 in words is "twenty-one billion, two hundred twelve million, one hundred twelve thousand, ten".