21502022434355 has 16 divisors (see below), whose sum is σ = 26228213632128. Its totient is φ = 16917820272000.

The previous prime is 21502022434327. The next prime is 21502022434367. The reversal of 21502022434355 is 55343422020512.

It is not a de Polignac number, because 21502022434355 - 2²⁶ = 21501955325491 is a prime.

It is a Duffinian number.

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, 889256 + ... + 6617765.

It is an arithmetic number, because the mean of its divisors is an integer number (1639263352008).

Almost surely, 2^{21502022434355} is an apocalyptic number.

21502022434355 is a deficient number, since it is larger than the sum of its proper divisors (4726191197773).

21502022434355 is an equidigital number, since it uses as much as digits as its factorization.

21502022434355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7516478.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 21502022434355 its reverse (55343422020512), we get a palindrome (76845444454867).

The spelling of 21502022434355 in words is "twenty-one trillion, five hundred two billion, twenty-two million, four hundred thirty-four thousand, three hundred fifty-five".