21253550612430 has 256 divisors, whose sum is σ = 55205256637440. Its totient is φ = 5219116646400.

The previous prime is 21253550612419. The next prime is 21253550612447. The reversal of 21253550612430 is 3421605535212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8793358582 + ... + 8793360998.

It is an arithmetic number, because the mean of its divisors is an integer number (215645533740).

Almost surely, 2^{21253550612430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21253550612430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27602628318720).

21253550612430 is an abundant number, since it is smaller than the sum of its proper divisors (33951706025010).

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

21253550612430 is a wasteful number, since it uses less digits than its factorization.

21253550612430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715.

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 21253550612430 in words is "twenty-one trillion, two hundred fifty-three billion, five hundred fifty million, six hundred twelve thousand, four hundred thirty".