21455525422333 has 4 divisors (see below), whose sum is σ = 21455628157660. Its totient is φ = 21455422687008.

The previous prime is 21455525422327. The next prime is 21455525422369. The reversal of 21455525422333 is 33322452555412.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 803708664004 + 20651816758329 = 896498^2 + 4544427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455525422333 - 2⁵ = 21455525422301 is a prime.

It is a super-2 number, since 2×21455525422333² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455525420333) 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, 51053760 + ... + 51472297.

It is an arithmetic number, because the mean of its divisors is an integer number (5363907039415).

Almost surely, 2^{21455525422333} is an apocalyptic number.

It is an amenable number.

21455525422333 is a deficient number, since it is larger than the sum of its proper divisors (102735327).

21455525422333 is a wasteful number, since it uses less digits than its factorization.

21455525422333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102735326.

The product of its digits is 4320000, while the sum is 46.

Adding to 21455525422333 its reverse (33322452555412), we get a palindrome (54777977977745).

The spelling of 21455525422333 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-five million, four hundred twenty-two thousand, three hundred thirty-three".