21121024041200 has 120 divisors (see below), whose sum is σ = 52180947942192. Its totient is φ = 8209624872960.

The previous prime is 21121024041199. The next prime is 21121024041217. The reversal of 21121024041200 is 214042012112.

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 23 ways as a sum of consecutive naturals, for example, 10740932 + ... + 12554268.

Almost surely, 2^{21121024041200} is an apocalyptic number.

21121024041200 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 21121024041200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26090473971096).

21121024041200 is an abundant number, since it is smaller than the sum of its proper divisors (31059923900992).

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

21121024041200 is a wasteful number, since it uses less digits than its factorization.

21121024041200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814179 (or 1814168 counting only the distinct ones).

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

Adding to 21121024041200 its reverse (214042012112), we get a palindrome (21335066053312).

The spelling of 21121024041200 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-four million, forty-one thousand, two hundred".