21450203551135 has 4 divisors (see below), whose sum is σ = 25740244261368. Its totient is φ = 17160162840904.

The previous prime is 21450203551087. The next prime is 21450203551223. The reversal of 21450203551135 is 53115530205412.

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

It is a cyclic number.

It is not a de Polignac number, because 21450203551135 - 2⁹ = 21450203550623 is a prime.

It is a super-2 number, since 2×21450203551135² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21450203551094 and 21450203551103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145020355109 + ... + 2145020355118.

It is an arithmetic number, because the mean of its divisors is an integer number (6435061065342).

Almost surely, 2^{21450203551135} is an apocalyptic number.

21450203551135 is a deficient number, since it is larger than the sum of its proper divisors (4290040710233).

21450203551135 is an equidigital number, since it uses as much as digits as its factorization.

21450203551135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290040710232.

The product of its (nonzero) digits is 90000, while the sum is 37.

Adding to 21450203551135 its reverse (53115530205412), we get a palindrome (74565733756547).

The spelling of 21450203551135 in words is "twenty-one trillion, four hundred fifty billion, two hundred three million, five hundred fifty-one thousand, one hundred thirty-five".