21251231212300 has 36 divisors (see below), whose sum is σ = 46207587013000. Its totient is φ = 8483457409920.

The previous prime is 21251231212279. The next prime is 21251231212333. The reversal of 21251231212300 is 321213215212.

It is a super-2 number, since 2×21251231212300² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212888289 + ... + 212988088.

Almost surely, 2^{21251231212300} is an apocalyptic number.

21251231212300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21251231212300 is an abundant number, since it is smaller than the sum of its proper divisors (24956355800700).

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

21251231212300 is a wasteful number, since it uses less digits than its factorization.

21251231212300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425876890 (or 425876883 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21251231212300 its reverse (321213215212), we get a palindrome (21572444427512).

The spelling of 21251231212300 in words is "twenty-one trillion, two hundred fifty-one billion, two hundred thirty-one million, two hundred twelve thousand, three hundred".