21352103528 has 64 divisors (see below), whose sum is σ = 47792160000. Its totient is φ = 8749504512.

The previous prime is 21352103527. The next prime is 21352103543. The reversal of 21352103528 is 82530125312.

It is a junction number, because it is equal to n+sod(n) for n = 21352103494 and 21352103503.

It is not an unprimeable number, because it can be changed into a prime (21352103527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103448 + ... + 231096.

It is an arithmetic number, because the mean of its divisors is an integer number (746752500).

Almost surely, 2^21352103528 is an apocalyptic number.

21352103528 is a gapful number since it is divisible by the number (28) 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 21352103528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23896080000).

21352103528 is an abundant number, since it is smaller than the sum of its proper divisors (26440056472).

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

21352103528 is a wasteful number, since it uses less digits than its factorization.

21352103528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127794 (or 127790 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 21352103528 in words is "twenty-one billion, three hundred fifty-two million, one hundred three thousand, five hundred twenty-eight".