21212301323400 has 144 divisors (see below), whose sum is σ = 72279602194800. Its totient is φ = 5142376060800.

The previous prime is 21212301323371. The next prime is 21212301323417. The reversal of 21212301323400 is 432310321212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 146017630 + ... + 146162829.

Almost surely, 2^{21212301323400} is an apocalyptic number.

21212301323400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212301323400 is an abundant number, since it is smaller than the sum of its proper divisors (51067300871400).

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

21212301323400 is a wasteful number, since it uses less digits than its factorization.

21212301323400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292180500 (or 292180480 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21212301323400 its reverse (432310321212), we get a palindrome (21644611644612).

The spelling of 21212301323400 in words is "twenty-one trillion, two hundred twelve billion, three hundred one million, three hundred twenty-three thousand, four hundred".