21455523540435 has 16 divisors (see below), whose sum is σ = 34427201104800. Its totient is φ = 11410158074880.

The previous prime is 21455523540431. The next prime is 21455523540449. The reversal of 21455523540435 is 53404532555412.

It is not a de Polignac number, because 21455523540435 - 2² = 21455523540431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21455523540431) 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, 2049232926 + ... + 2049243395.

It is an arithmetic number, because the mean of its divisors is an integer number (2151700069050).

Almost surely, 2^{21455523540435} is an apocalyptic number.

21455523540435 is a deficient number, since it is larger than the sum of its proper divisors (12971677564365).

21455523540435 is a wasteful number, since it uses less digits than its factorization.

21455523540435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098476678.

The product of its (nonzero) digits is 7200000, while the sum is 48.

The spelling of 21455523540435 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-three million, five hundred forty thousand, four hundred thirty-five".