21434120553 has 8 divisors (see below), whose sum is σ = 28579693600. Its totient is φ = 14288980608.

The previous prime is 21434120551. The next prime is 21434120567. The reversal of 21434120553 is 35502143412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21434120553 - 2¹ = 21434120551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21434120553.

It is not an unprimeable number, because it can be changed into a prime (21434120551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33858 + ... + 209796.

It is an arithmetic number, because the mean of its divisors is an integer number (3572461700).

Almost surely, 2^21434120553 is an apocalyptic number.

It is an amenable number.

21434120553 is a deficient number, since it is larger than the sum of its proper divisors (7145573047).

21434120553 is a wasteful number, since it uses less digits than its factorization.

21434120553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216551.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21434120553 its reverse (35502143412), we get a palindrome (56936263965).

The spelling of 21434120553 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty thousand, five hundred fifty-three".