21434355453121 has 32 divisors (see below), whose sum is σ = 23428178923520. Its totient is φ = 19490506675200.

The previous prime is 21434355453061. The next prime is 21434355453163. The reversal of 21434355453121 is 12135455343412.

It is a cyclic number.

It is not a de Polignac number, because 21434355453121 - 2²⁷ = 21434221235393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434355454121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3418009216 + ... + 3418015486.

It is an arithmetic number, because the mean of its divisors is an integer number (732130591360).

Almost surely, 2^{21434355453121} is an apocalyptic number.

It is an amenable number.

21434355453121 is a deficient number, since it is larger than the sum of its proper divisors (1993823470399).

21434355453121 is a wasteful number, since it uses less digits than its factorization.

21434355453121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10217.

The product of its digits is 864000, while the sum is 43.

The spelling of 21434355453121 in words is "twenty-one trillion, four hundred thirty-four billion, three hundred fifty-five million, four hundred fifty-three thousand, one hundred twenty-one".