21454424220 has 48 divisors (see below), whose sum is σ = 60623529120. Its totient is φ = 5668690176.

The previous prime is 21454424213. The next prime is 21454424239. The reversal of 21454424220 is 2242445412.

It is a super-2 number, since 2×21454424220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1633707 + ... + 1646786.

It is an arithmetic number, because the mean of its divisors is an integer number (1262990190).

Almost surely, 2^21454424220 is an apocalyptic number.

21454424220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454424220 is an abundant number, since it is smaller than the sum of its proper divisors (39169104900).

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

21454424220 is a wasteful number, since it uses less digits than its factorization.

21454424220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280614 (or 3280612 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 21454424220 its reverse (2242445412), we get a palindrome (23696869632).

The spelling of 21454424220 in words is "twenty-one billion, four hundred fifty-four million, four hundred twenty-four thousand, two hundred twenty".