21503323042354 has 32 divisors (see below), whose sum is σ = 33850673712000. Its totient is φ = 10225152436224.

The previous prime is 21503323042349. The next prime is 21503323042391. The reversal of 21503323042354 is 45324032330512.

It is a super-2 number, since 2×21503323042354² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53559792 + ... + 53959780.

It is an arithmetic number, because the mean of its divisors is an integer number (1057833553500).

Almost surely, 2^{21503323042354} is an apocalyptic number.

21503323042354 is a deficient number, since it is larger than the sum of its proper divisors (12347350669646).

21503323042354 is a wasteful number, since it uses less digits than its factorization.

21503323042354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406722.

The product of its (nonzero) digits is 259200, while the sum is 37.

Adding to 21503323042354 its reverse (45324032330512), we get a palindrome (66827355372866).

The spelling of 21503323042354 in words is "twenty-one trillion, five hundred three billion, three hundred twenty-three million, forty-two thousand, three hundred fifty-four".