21352154432 has 28 divisors (see below), whose sum is σ = 48423636960. Its totient is φ = 9150923136.

The previous prime is 21352154431. The next prime is 21352154449. The reversal of 21352154432 is 23445125312.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352154431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23830082 + ... + 23830977.

Almost surely, 2^21352154432 is an apocalyptic number.

It is an amenable number.

21352154432 is an abundant number, since it is smaller than the sum of its proper divisors (27071482528).

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

21352154432 is an equidigital number, since it uses as much as digits as its factorization.

21352154432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47661078 (or 47661068 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

Adding to 21352154432 its reverse (23445125312), we get a palindrome (44797279744).

The spelling of 21352154432 in words is "twenty-one billion, three hundred fifty-two million, one hundred fifty-four thousand, four hundred thirty-two".