21221401330 has 16 divisors (see below), whose sum is σ = 38490116544. Its totient is φ = 8423761840.

The previous prime is 21221401297. The next prime is 21221401337. The reversal of 21221401330 is 3310412212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221401298 and 21221401307.

It is not an unprimeable number, because it can be changed into a prime (21221401337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8098462 + ... + 8101081.

It is an arithmetic number, because the mean of its divisors is an integer number (2405632284).

Almost surely, 2^21221401330 is an apocalyptic number.

21221401330 is a deficient number, since it is larger than the sum of its proper divisors (17268715214).

21221401330 is a wasteful number, since it uses less digits than its factorization.

21221401330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16199681.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21221401330 its reverse (3310412212), we get a palindrome (24531813542).

The spelling of 21221401330 in words is "twenty-one billion, two hundred twenty-one million, four hundred one thousand, three hundred thirty".