21212111102010 has 16 divisors (see below), whose sum is σ = 50909066644896. Its totient is φ = 5656562960528.

The previous prime is 21212111101963. The next prime is 21212111102081. The reversal of 21212111102010 is 1020111121212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353535185004 + ... + 353535185063.

It is an arithmetic number, because the mean of its divisors is an integer number (3181816665306).

Almost surely, 2^{21212111102010} is an apocalyptic number.

21212111102010 is an abundant number, since it is smaller than the sum of its proper divisors (29696955542886).

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

21212111102010 is a wasteful number, since it uses less digits than its factorization.

21212111102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707070370077.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212111102010 its reverse (1020111121212), we get a palindrome (22232222223222).

The spelling of 21212111102010 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, one hundred two thousand, ten".