21221120010 has 32 divisors (see below), whose sum is σ = 50935730112. Its totient is φ = 5658405120.

The previous prime is 21221120003. The next prime is 21221120021. The reversal of 21221120010 is 1002112212.

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 15 ways as a sum of consecutive naturals, for example, 338337 + ... + 396123.

It is an arithmetic number, because the mean of its divisors is an integer number (1591741566).

Almost surely, 2^21221120010 is an apocalyptic number.

21221120010 is an abundant number, since it is smaller than the sum of its proper divisors (29714610102).

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

21221120010 is a wasteful number, since it uses less digits than its factorization.

21221120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70038.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21221120010 its reverse (1002112212), we get a palindrome (22223232222).

It can be divided in two parts, 212211 and 20010, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21221120010 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, ten".