21221200101010 has 32 divisors (see below), whose sum is σ = 47013120225792. Its totient is φ = 6716160031680.

The previous prime is 21221200100959. The next prime is 21221200101029. The reversal of 21221200101010 is 1010100212212.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11659999146 + ... + 11660000965.

It is an arithmetic number, because the mean of its divisors is an integer number (1469160007056).

Almost surely, 2^{21221200101010} is an apocalyptic number.

21221200101010 is an abundant number, since it is smaller than the sum of its proper divisors (25791920124782).

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

21221200101010 is a wasteful number, since it uses less digits than its factorization.

21221200101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23320000138.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221200101010 its reverse (1010100212212), we get a palindrome (22231300313222).

The spelling of 21221200101010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, ten".