21220530035320 has 64 divisors (see below), whose sum is σ = 59527720627200. Its totient is φ = 6614191178880.

The previous prime is 21220530035317. The next prime is 21220530035381. The reversal of 21220530035320 is 2353003502212.

It is a happy number.

It is a super-3 number, since 3×21220530035320³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3444888160 + ... + 3444894319.

It is an arithmetic number, because the mean of its divisors is an integer number (930120634800).

Almost surely, 2^{21220530035320} is an apocalyptic number.

21220530035320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220530035320 is an abundant number, since it is smaller than the sum of its proper divisors (38307190591880).

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

21220530035320 is a wasteful number, since it uses less digits than its factorization.

21220530035320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889782508 (or 6889782504 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21220530035320 its reverse (2353003502212), we get a palindrome (23573533537532).

The spelling of 21220530035320 in words is "twenty-one trillion, two hundred twenty billion, five hundred thirty million, thirty-five thousand, three hundred twenty".