21211121312300 has 18 divisors (see below), whose sum is σ = 46028133247908. Its totient is φ = 8484448524880.

The previous prime is 21211121312243. The next prime is 21211121312317. The reversal of 21211121312300 is 321312111212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106055606462 + ... + 106055606661.

Almost surely, 2^{21211121312300} is an apocalyptic number.

21211121312300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211121312300 is an abundant number, since it is smaller than the sum of its proper divisors (24817011935608).

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

21211121312300 is a wasteful number, since it uses less digits than its factorization.

21211121312300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212111213137 (or 212111213130 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21211121312300 its reverse (321312111212), we get a palindrome (21532433423512).

The spelling of 21211121312300 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, three hundred twelve thousand, three hundred".