21222030053440 has 56 divisors (see below), whose sum is σ = 51035305271832. Its totient is φ = 8404764364800.

The previous prime is 21222030053353. The next prime is 21222030053447. The reversal of 21222030053440 is 4435003022212.

It can be written as a sum of positive squares in 4 ways, for example, as 14536040763456 + 6685989289984 = 3812616^2 + 2585728^2 .

It is a super-2 number, since 2×21222030053440² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222030053399 and 21222030053408.

It is not an unprimeable number, because it can be changed into a prime (21222030053447) 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, 328278789 + ... + 328343428.

It is an arithmetic number, because the mean of its divisors is an integer number (911344736997).

Almost surely, 2^{21222030053440} is an apocalyptic number.

21222030053440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222030053440 is an abundant number, since it is smaller than the sum of its proper divisors (29813275218392).

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

21222030053440 is a wasteful number, since it uses less digits than its factorization.

21222030053440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656622335 (or 656622325 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21222030053440 its reverse (4435003022212), we get a palindrome (25657033075652).

The spelling of 21222030053440 in words is "twenty-one trillion, two hundred twenty-two billion, thirty million, fifty-three thousand, four hundred forty".