21022120452 has 24 divisors (see below), whose sum is σ = 49054221216. Its totient is φ = 7007001088.

The previous prime is 21022120439. The next prime is 21022120463. The reversal of 21022120452 is 25402122012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280663 + ... + 347585.

It is an arithmetic number, because the mean of its divisors is an integer number (2043925884).

Almost surely, 2^21022120452 is an apocalyptic number.

It is an amenable number.

21022120452 is an abundant number, since it is smaller than the sum of its proper divisors (28032100764).

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

21022120452 is a wasteful number, since it uses less digits than its factorization.

21022120452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93107 (or 93105 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 21022120452 its reverse (25402122012), we get a palindrome (46424242464).

The spelling of 21022120452 in words is "twenty-one billion, twenty-two million, one hundred twenty thousand, four hundred fifty-two".