22021012020 has 48 divisors (see below), whose sum is σ = 70467239808. Its totient is φ = 5033374080.

The previous prime is 22021011983. The next prime is 22021012049. The reversal of 22021012020 is 2021012022.

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 = 22021011987 and 22021012005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26215071 + ... + 26215910.

It is an arithmetic number, because the mean of its divisors is an integer number (1468067496).

Almost surely, 2^22021012020 is an apocalyptic number.

22021012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021012020 is an abundant number, since it is smaller than the sum of its proper divisors (48446227788).

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

22021012020 is a wasteful number, since it uses less digits than its factorization.

22021012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52431000 (or 52430998 counting only the distinct ones).

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

Adding to 22021012020 its reverse (2021012022), we get a palindrome (24042024042).

The spelling of 22021012020 in words is "twenty-two billion, twenty-one million, twelve thousand, twenty".