22021012100 has 72 divisors (see below), whose sum is σ = 49123605888. Its totient is φ = 8565177600.

The previous prime is 22021012049. The next prime is 22021012109. The reversal of 22021012100 is 121012022.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22021012109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497057 + ... + 539543.

It is an arithmetic number, because the mean of its divisors is an integer number (682272304).

Almost surely, 2^22021012100 is an apocalyptic number.

22021012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22021012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24561802944).

22021012100 is an abundant number, since it is smaller than the sum of its proper divisors (27102593788).

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

22021012100 is a wasteful number, since it uses less digits than its factorization.

22021012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42645 (or 42638 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22021012100 its reverse (121012022), we get a palindrome (22142024122).

The spelling of 22021012100 in words is "twenty-two billion, twenty-one million, twelve thousand, one hundred".