21221220100010 has 48 divisors (see below), whose sum is σ = 44456734228320. Its totient is φ = 7272228529440.

The previous prime is 21221220099967. The next prime is 21221220100057. The reversal of 21221220100010 is 1000102212212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9782540 + ... + 11753319.

It is an arithmetic number, because the mean of its divisors is an integer number (926181963090).

Almost surely, 2^{21221220100010} is an apocalyptic number.

21221220100010 is an abundant number, since it is smaller than the sum of its proper divisors (23235514128310).

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

21221220100010 is a wasteful number, since it uses less digits than its factorization.

21221220100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21537891 (or 21537884 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221220100010 its reverse (1000102212212), we get a palindrome (22221322312222).

The spelling of 21221220100010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred thousand, ten".