21450254031235 has 32 divisors (see below), whose sum is σ = 26252898610752. Its totient is φ = 16822921290240.

The previous prime is 21450254031223. The next prime is 21450254031289. The reversal of 21450254031235 is 53213045205412.

It is a happy number.

It is not a de Polignac number, because 21450254031235 - 2⁴¹ = 19251230775683 is a prime.

It is a super-2 number, since 2×21450254031235² (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 = 21450254031194 and 21450254031203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17187597 + ... + 18393313.

It is an arithmetic number, because the mean of its divisors is an integer number (820403081586).

Almost surely, 2^{21450254031235} is an apocalyptic number.

21450254031235 is a deficient number, since it is larger than the sum of its proper divisors (4802644579517).

21450254031235 is a wasteful number, since it uses less digits than its factorization.

21450254031235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206183.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21450254031235 its reverse (53213045205412), we get a palindrome (74663299236647).

The spelling of 21450254031235 in words is "twenty-one trillion, four hundred fifty billion, two hundred fifty-four million, thirty-one thousand, two hundred thirty-five".