23212121000000 has 196 divisors, whose sum is σ = 58086010473924. Its totient is φ = 9202636800000.

The previous prime is 23212120999997. The next prime is 23212121000023. The reversal of 23212121000000 is 12121232.

It is a happy number.

It can be written as a sum of positive squares in 14 ways, for example, as 16635891578944 + 6576229421056 = 4078712^2 + 2564416^2 .

It is a super-2 number, since 2×23212121000000² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 112897292 + ... + 113102708.

Almost surely, 2^{23212121000000} is an apocalyptic number.

23212121000000 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 23212121000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29043005236962).

23212121000000 is an abundant number, since it is smaller than the sum of its proper divisors (34873889473924).

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

23212121000000 is an frugal number, since it uses more digits than its factorization.

23212121000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205572 (or 205537 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 23212121000000 its reverse (12121232), we get a palindrome (23212133121232).

The spelling of 23212121000000 in words is "twenty-three trillion, two hundred twelve billion, one hundred twenty-one million", and thus it is an aban number.