21222122121200 has 240 divisors, whose sum is σ = 68456927809536. Its totient is φ = 6105865190400.

The previous prime is 21222122121197. The next prime is 21222122121223. The reversal of 21222122121200 is 212122122212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 26100752 + ... + 26901551.

Almost surely, 2^{21222122121200} is an apocalyptic number.

21222122121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222122121200 is an abundant number, since it is smaller than the sum of its proper divisors (47234805688336).

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

21222122121200 is a wasteful number, since it uses less digits than its factorization.

21222122121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53002352 (or 53002341 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222122121200 its reverse (212122122212), we get a palindrome (21434244243412).

The spelling of 21222122121200 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred".