21010101224 has 48 divisors (see below), whose sum is σ = 46027673280. Its totient is φ = 8964624480.

The previous prime is 21010101209. The next prime is 21010101241. The reversal of 21010101224 is 42210101012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21010101199 and 21010101208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29072 + ... + 207039.

It is an arithmetic number, because the mean of its divisors is an integer number (958909860).

Almost surely, 2^21010101224 is an apocalyptic number.

It is an amenable number.

21010101224 is an abundant number, since it is smaller than the sum of its proper divisors (25017572056).

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

21010101224 is a wasteful number, since it uses less digits than its factorization.

21010101224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236358 (or 236347 counting only the distinct ones).

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

Adding to 21010101224 its reverse (42210101012), we get a palindrome (63220202236).

The spelling of 21010101224 in words is "twenty-one billion, ten million, one hundred one thousand, two hundred twenty-four".