22021001020 has 12 divisors (see below), whose sum is σ = 46244102184. Its totient is φ = 8808400400.

The previous prime is 22021001011. The next prime is 22021001047. The reversal of 22021001020 is 2010012022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22021000988 and 22021001006.

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 3 ways as a sum of consecutive naturals, for example, 550525006 + ... + 550525045.

It is an arithmetic number, because the mean of its divisors is an integer number (3853675182).

Almost surely, 2^22021001020 is an apocalyptic number.

22021001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021001020 is an abundant number, since it is smaller than the sum of its proper divisors (24223101164).

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

22021001020 is a wasteful number, since it uses less digits than its factorization.

22021001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101050060 (or 1101050058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 22021001020 its reverse (2010012022), we get a palindrome (24031013042).

The spelling of 22021001020 in words is "twenty-two billion, twenty-one million, one thousand, twenty".