21528935329512 has 256 divisors, whose sum is σ = 63916070400000. Its totient is φ = 5982536641536.

The previous prime is 21528935329507. The next prime is 21528935329547. The reversal of 21528935329512 is 21592353982512.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12788439 + ... + 14373657.

It is an arithmetic number, because the mean of its divisors is an integer number (249672150000).

Almost surely, 2^{21528935329512} 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 21528935329512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31958035200000).

21528935329512 is an abundant number, since it is smaller than the sum of its proper divisors (42387135070488).

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

21528935329512 is a wasteful number, since it uses less digits than its factorization.

21528935329512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585368 (or 1585364 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 57.

The spelling of 21528935329512 in words is "twenty-one trillion, five hundred twenty-eight billion, nine hundred thirty-five million, three hundred twenty-nine thousand, five hundred twelve".