21124718988751 has 8 divisors (see below), whose sum is σ = 24975037228320. Its totient is φ = 17482526059488.

The previous prime is 21124718988749. The next prime is 21124718988757. The reversal of 21124718988751 is 15788981742112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21124718988751 - 2¹ = 21124718988749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124718988757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52031327356 + ... + 52031327761.

It is an arithmetic number, because the mean of its divisors is an integer number (3121879653540).

Almost surely, 2^{21124718988751} is an apocalyptic number.

21124718988751 is a deficient number, since it is larger than the sum of its proper divisors (3850318239569).

21124718988751 is a wasteful number, since it uses less digits than its factorization.

21124718988751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104062655153.

The product of its digits is 18063360, while the sum is 64.

The spelling of 21124718988751 in words is "twenty-one trillion, one hundred twenty-four billion, seven hundred eighteen million, nine hundred eighty-eight thousand, seven hundred fifty-one".