21121023223300 has 288 divisors, whose sum is σ = 61650164136960. Its totient is φ = 6065652902400.

The previous prime is 21121023223249. The next prime is 21121023223319. The reversal of 21121023223300 is 332232012112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 54561831 + ... + 54947569.

It is an arithmetic number, because the mean of its divisors is an integer number (214063069920).

Almost surely, 2^{21121023223300} is an apocalyptic number.

21121023223300 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 21121023223300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30825082068480).

21121023223300 is an abundant number, since it is smaller than the sum of its proper divisors (40529140913660).

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

21121023223300 is a wasteful number, since it uses less digits than its factorization.

21121023223300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386331 (or 386324 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21121023223300 its reverse (332232012112), we get a palindrome (21453255235412).

The spelling of 21121023223300 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-three million, two hundred twenty-three thousand, three hundred".