21898458927072 has 768 divisors, whose sum is σ = 79978421053440. Its totient is φ = 5675061657600.

The previous prime is 21898458927071. The next prime is 21898458927089. The reversal of 21898458927072 is 27072985489812.

21898458927072 is a `hidden beast` number, since 2 + 1 + 89 + 8 + 458 + 9 + 27 + 0 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898458927071) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7102969243 + ... + 7102972325.

It is an arithmetic number, because the mean of its divisors is an integer number (104138569080).

Almost surely, 2^{21898458927072} 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 21898458927072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39989210526720).

21898458927072 is an abundant number, since it is smaller than the sum of its proper divisors (58079962126368).

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

21898458927072 is a wasteful number, since it uses less digits than its factorization.

21898458927072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664 (or 4650 counting only the distinct ones).

The product of its (nonzero) digits is 325140480, while the sum is 72.

The spelling of 21898458927072 in words is "twenty-one trillion, eight hundred ninety-eight billion, four hundred fifty-eight million, nine hundred twenty-seven thousand, seventy-two".