21212110010 has 32 divisors (see below), whose sum is σ = 46992984192. Its totient is φ = 6713282880.

The previous prime is 21212109967. The next prime is 21212110013. The reversal of 21212110010 is 1001121212.

It is a super-3 number, since 3×21212110010³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21212109973 and 21212110000.

It is not an unprimeable number, because it can be changed into a prime (21212110013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11654096 + ... + 11655915.

It is an arithmetic number, because the mean of its divisors is an integer number (1468530756).

Almost surely, 2^21212110010 is an apocalyptic number.

21212110010 is an abundant number, since it is smaller than the sum of its proper divisors (25780874182).

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

21212110010 is a wasteful number, since it uses less digits than its factorization.

21212110010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310038.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21212110010 its reverse (1001121212), we get a palindrome (22213231222).

The spelling of 21212110010 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, ten".