21222010010100 has 72 divisors (see below), whose sum is σ = 61408570468000. Its totient is φ = 5658629258880.

The previous prime is 21222010009961. The next prime is 21222010010129. The reversal of 21222010010100 is 101001022212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 613975 + ... + 6543774.

Almost surely, 2^{21222010010100} is an apocalyptic number.

21222010010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222010010100 is an abundant number, since it is smaller than the sum of its proper divisors (40186560457900).

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

21222010010100 is a wasteful number, since it uses less digits than its factorization.

21222010010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167649 (or 7167642 counting only the distinct ones).

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

Adding to 21222010010100 its reverse (101001022212), we get a palindrome (21323011032312).

The spelling of 21222010010100 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, ten thousand, one hundred".