22121010000 has 150 divisors (see below), whose sum is σ = 77360681970. Its totient is φ = 5898912000.

The previous prime is 22121009983. The next prime is 22121010059. The reversal of 22121010000 is 1012122.

It can be written as a sum of positive squares in 5 ways, for example, as 6527993616 + 15593016384 = 80796^2 + 124872^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 32895 + ... + 212894.

Almost surely, 2^22121010000 is an apocalyptic number.

22121010000 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 22121010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38680340985).

22121010000 is an abundant number, since it is smaller than the sum of its proper divisors (55239671970).

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

22121010000 is a wasteful number, since it uses less digits than its factorization.

22121010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245823 (or 245799 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 22121010000 its reverse (1012122), we get a palindrome (22122022122).

The spelling of 22121010000 in words is "twenty-two billion, one hundred twenty-one million, ten thousand".