21444020053355 has 16 divisors (see below), whose sum is σ = 27305367421824. Its totient is φ = 16111212902400.

The previous prime is 21444020053303. The next prime is 21444020053373. The reversal of 21444020053355 is 55335002044412.

It is a de Polignac number, because none of the positive numbers 2^k-21444020053355 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272404046 + ... + 272482755.

It is an arithmetic number, because the mean of its divisors is an integer number (1706585463864).

Almost surely, 2^{21444020053355} is an apocalyptic number.

21444020053355 is a deficient number, since it is larger than the sum of its proper divisors (5861347368469).

21444020053355 is a wasteful number, since it uses less digits than its factorization.

21444020053355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544887286.

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

Adding to 21444020053355 its reverse (55335002044412), we get a palindrome (76779022097767).

The spelling of 21444020053355 in words is "twenty-one trillion, four hundred forty-four billion, twenty million, fifty-three thousand, three hundred fifty-five".