21021222123300 has 144 divisors (see below), whose sum is σ = 69549303420800. Its totient is φ = 4802146007040.

The previous prime is 21021222123283. The next prime is 21021222123347. The reversal of 21021222123300 is 332122212012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 915126 + ... + 6548274.

Almost surely, 2^{21021222123300} is an apocalyptic number.

21021222123300 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 21021222123300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34774651710400).

21021222123300 is an abundant number, since it is smaller than the sum of its proper divisors (48528081297500).

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

21021222123300 is a wasteful number, since it uses less digits than its factorization.

21021222123300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5634950 (or 5634943 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21021222123300 its reverse (332122212012), we get a palindrome (21353344335312).

The spelling of 21021222123300 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty-three thousand, three hundred".