21234045417 has 32 divisors (see below), whose sum is σ = 31943331840. Its totient is φ = 12456797760.

The previous prime is 21234045409. The next prime is 21234045421. The reversal of 21234045417 is 71454043212.

It is not a de Polignac number, because 21234045417 - 2³ = 21234045409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21234045407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50067 + ... + 212072.

It is an arithmetic number, because the mean of its divisors is an integer number (998229120).

Almost surely, 2^21234045417 is an apocalyptic number.

It is an amenable number.

21234045417 is a deficient number, since it is larger than the sum of its proper divisors (10709286423).

21234045417 is a wasteful number, since it uses less digits than its factorization.

21234045417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262253.

The product of its (nonzero) digits is 26880, while the sum is 33.

Adding to 21234045417 its reverse (71454043212), we get a palindrome (92688088629).

The spelling of 21234045417 in words is "twenty-one billion, two hundred thirty-four million, forty-five thousand, four hundred seventeen".