21221133310 has 64 divisors (see below), whose sum is σ = 43150786560. Its totient is φ = 7455381120.

The previous prime is 21221133301. The next prime is 21221133317. The reversal of 21221133310 is 1333112212.

It is a super-2 number, since 2×21221133310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221133317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 552511 + ... + 589669.

It is an arithmetic number, because the mean of its divisors is an integer number (674231040).

Almost surely, 2^21221133310 is an apocalyptic number.

21221133310 is an abundant number, since it is smaller than the sum of its proper divisors (21929653250).

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

21221133310 is a wasteful number, since it uses less digits than its factorization.

21221133310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37393.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21221133310 its reverse (1333112212), we get a palindrome (22554245522).

The spelling of 21221133310 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred ten".