22012021020 has 48 divisors (see below), whose sum is σ = 67236720768. Its totient is φ = 5336247360.

The previous prime is 22012021013. The next prime is 22012021049. The reversal of 22012021020 is 2012021022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22012020987 and 22012021005.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 16675114 + ... + 16676433.

It is an arithmetic number, because the mean of its divisors is an integer number (1400765016).

Almost surely, 2^22012021020 is an apocalyptic number.

22012021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22012021020 is an abundant number, since it is smaller than the sum of its proper divisors (45224699748).

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

22012021020 is a wasteful number, since it uses less digits than its factorization.

22012021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33351570 (or 33351568 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22012021020 its reverse (2012021022), we get a palindrome (24024042042).

The spelling of 22012021020 in words is "twenty-two billion, twelve million, twenty-one thousand, twenty".