21131210121300 has 180 divisors, whose sum is σ = 68503424909920. Its totient is φ = 5634628246080.

The previous prime is 21131210121277. The next prime is 21131210121311. The reversal of 21131210121300 is 312101213112.

21131210121300 is a `hidden beast` number, since 2 + 1 + 1 + 31 + 210 + 121 + 300 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 141019017 + ... + 141168783.

Almost surely, 2^{21131210121300} is an apocalyptic number.

21131210121300 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 21131210121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34251712454960).

21131210121300 is an abundant number, since it is smaller than the sum of its proper divisors (47372214788620).

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

21131210121300 is a wasteful number, since it uses less digits than its factorization.

21131210121300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167212 (or 167196 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21131210121300 its reverse (312101213112), we get a palindrome (21443311334412).

The spelling of 21131210121300 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred ten million, one hundred twenty-one thousand, three hundred".