21221342051353 has 4 divisors (see below), whose sum is σ = 22144009097088. Its totient is φ = 20298675005620.

The previous prime is 21221342051347. The next prime is 21221342051381. The reversal of 21221342051353 is 35315024312212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221342051353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221342051323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461333522833 + ... + 461333522878.

It is an arithmetic number, because the mean of its divisors is an integer number (5536002274272).

Almost surely, 2^{21221342051353} is an apocalyptic number.

21221342051353 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21221342051353 is a deficient number, since it is larger than the sum of its proper divisors (922667045735).

21221342051353 is an equidigital number, since it uses as much as digits as its factorization.

21221342051353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922667045734.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21221342051353 its reverse (35315024312212), we get a palindrome (56536366363565).

The spelling of 21221342051353 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-two million, fifty-one thousand, three hundred fifty-three".