21243076957500 has 240 divisors, whose sum is σ = 62477815099392. Its totient is φ = 5615628480000.

The previous prime is 21243076957493. The next prime is 21243076957507. The reversal of 21243076957500 is 575967034212.

It is an interprime number because it is at equal distance from previous prime (21243076957493) and next prime (21243076957507).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243076957507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1258244059 + ... + 1258260941.

Almost surely, 2^{21243076957500} is an apocalyptic number.

21243076957500 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 21243076957500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31238907549696).

21243076957500 is an abundant number, since it is smaller than the sum of its proper divisors (41234738141892).

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

21243076957500 is a wasteful number, since it uses less digits than its factorization.

21243076957500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18358 (or 18341 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 21243076957500 in words is "twenty-one trillion, two hundred forty-three billion, seventy-six million, nine hundred fifty-seven thousand, five hundred".