21220301144 has 32 divisors (see below), whose sum is σ = 45478087200. Its totient is φ = 9093212160.

The previous prime is 21220301131. The next prime is 21220301177. The reversal of 21220301144 is 44110302212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499322 + ... + 540150.

It is an arithmetic number, because the mean of its divisors is an integer number (1421190225).

Almost surely, 2^21220301144 is an apocalyptic number.

It is an amenable number.

21220301144 is an abundant number, since it is smaller than the sum of its proper divisors (24257786056).

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

21220301144 is a wasteful number, since it uses less digits than its factorization.

21220301144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50123 (or 50119 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21220301144 its reverse (44110302212), we get a palindrome (65330603356).

The spelling of 21220301144 in words is "twenty-one billion, two hundred twenty million, three hundred one thousand, one hundred forty-four".