21122225420 has 48 divisors (see below), whose sum is σ = 44546392800. Its totient is φ = 8412833280.

The previous prime is 21122225419. The next prime is 21122225431. The reversal of 21122225420 is 2452222112.

It is a super-2 number, since 2×21122225420² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5374016 + ... + 5377944.

It is an arithmetic number, because the mean of its divisors is an integer number (928049850).

Almost surely, 2^21122225420 is an apocalyptic number.

21122225420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122225420 is an abundant number, since it is smaller than the sum of its proper divisors (23424167380).

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

21122225420 is a wasteful number, since it uses less digits than its factorization.

21122225420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21122225420 its reverse (2452222112), we get a palindrome (23574447532).

The spelling of 21122225420 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, four hundred twenty".