21025244622 has 8 divisors (see below), whose sum is σ = 42050489256. Its totient is φ = 7008414872.

The previous prime is 21025244609. The next prime is 21025244629. The reversal of 21025244622 is 22644252012.

It is a sphenic number, since it is the product of 3 distinct primes.

21025244622 is an admirable number.

It is a super-2 number, since 2×21025244622² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21025244622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025244629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1752103713 + ... + 1752103724.

It is an arithmetic number, because the mean of its divisors is an integer number (5256311157).

Almost surely, 2^21025244622 is an apocalyptic number.

21025244622 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21025244622 is a wasteful number, since it uses less digits than its factorization.

21025244622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504207442.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21025244622 its reverse (22644252012), we get a palindrome (43669496634).

The spelling of 21025244622 in words is "twenty-one billion, twenty-five million, two hundred forty-four thousand, six hundred twenty-two".