21203321240124 has 216 divisors, whose sum is σ = 57663608970240. Its totient is φ = 6566070760704.

The previous prime is 21203321240099. The next prime is 21203321240173. The reversal of 21203321240124 is 42104212330212.

21203321240124 is a `hidden beast` number, since 2 + 1 + 20 + 3 + 3 + 212 + 401 + 24 = 666.

It is a super-2 number, since 2×21203321240124² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1562853189 + ... + 1562866755.

It is an arithmetic number, because the mean of its divisors is an integer number (266961152640).

Almost surely, 2^{21203321240124} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203321240124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28831804485120).

21203321240124 is an abundant number, since it is smaller than the sum of its proper divisors (36460287730116).

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

21203321240124 is a wasteful number, since it uses less digits than its factorization.

21203321240124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15937 (or 15913 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21203321240124 its reverse (42104212330212), we get a palindrome (63307533570336).

The spelling of 21203321240124 in words is "twenty-one trillion, two hundred three billion, three hundred twenty-one million, two hundred forty thousand, one hundred twenty-four".