21532351435455 has 32 divisors (see below), whose sum is σ = 39375807335424. Its totient is φ = 9842769478656.

The previous prime is 21532351435403. The next prime is 21532351435457. The reversal of 21532351435455 is 55453415323512.

It is not a de Polignac number, because 21532351435455 - 2⁷ = 21532351435327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532351435457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4399099 + ... + 7900428.

It is an arithmetic number, because the mean of its divisors is an integer number (1230493979232).

Almost surely, 2^{21532351435455} is an apocalyptic number.

21532351435455 is a deficient number, since it is larger than the sum of its proper divisors (17843455899969).

21532351435455 is a wasteful number, since it uses less digits than its factorization.

21532351435455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316215.

The product of its digits is 5400000, while the sum is 48.

Adding to 21532351435455 its reverse (55453415323512), we get a palindrome (76985766758967).

The spelling of 21532351435455 in words is "twenty-one trillion, five hundred thirty-two billion, three hundred fifty-one million, four hundred thirty-five thousand, four hundred fifty-five".