21221222010010 has 384 divisors, whose sum is σ = 45088929552384. Its totient is φ = 7120742400000.

The previous prime is 21221222009993. The next prime is 21221222010011. The reversal of 21221222010010 is 1001022212212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21221222010011) by changing a digit.

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 191 ways as a sum of consecutive naturals, for example, 154899430662 + ... + 154899430798.

It is an arithmetic number, because the mean of its divisors is an integer number (117419087376).

Almost surely, 2^{21221222010010} is an apocalyptic number.

21221222010010 is an abundant number, since it is smaller than the sum of its proper divisors (23867707542374).

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

21221222010010 is a wasteful number, since it uses less digits than its factorization.

21221222010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221222010010 its reverse (1001022212212), we get a palindrome (22222244222222).

It can be divided in two parts, 212212 and 22010010, that added together give a palindrome (22222222).

The spelling of 21221222010010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, ten thousand, ten".