21455521450435 has 4 divisors (see below), whose sum is σ = 25746625740528. Its totient is φ = 17164417160344.

The previous prime is 21455521450369. The next prime is 21455521450439. The reversal of 21455521450435 is 53405412555412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21455521450435 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455521450439) 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, 2145552145039 + ... + 2145552145048.

It is an arithmetic number, because the mean of its divisors is an integer number (6436656435132).

Almost surely, 2^{21455521450435} is an apocalyptic number.

21455521450435 is a deficient number, since it is larger than the sum of its proper divisors (4291104290093).

21455521450435 is an equidigital number, since it uses as much as digits as its factorization.

21455521450435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291104290092.

The product of its (nonzero) digits is 2400000, while the sum is 46.

The spelling of 21455521450435 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-one million, four hundred fifty thousand, four hundred thirty-five".