21043222220 has 24 divisors (see below), whose sum is σ = 45616276608. Its totient is φ = 8145763200.

The previous prime is 21043222153. The next prime is 21043222229. The reversal of 21043222220 is 2222234012.

It is a super-3 number, since 3×21043222220³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21043222192 and 21043222201.

It is not an unprimeable number, because it can be changed into a prime (21043222229) 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, 16969721 + ... + 16970960.

It is an arithmetic number, because the mean of its divisors is an integer number (1900678192).

Almost surely, 2^21043222220 is an apocalyptic number.

21043222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043222220 is an abundant number, since it is smaller than the sum of its proper divisors (24573054388).

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

21043222220 is a wasteful number, since it uses less digits than its factorization.

21043222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33940721 (or 33940719 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21043222220 its reverse (2222234012), we get a palindrome (23265456232).

The spelling of 21043222220 in words is "twenty-one billion, forty-three million, two hundred twenty-two thousand, two hundred twenty".