21234034142045 has 32 divisors (see below), whose sum is σ = 27062823362400. Its totient is φ = 15938748334080.

The previous prime is 21234034141987. The next prime is 21234034142047. The reversal of 21234034142045 is 54024143043212.

It can be written as a sum of positive squares in 16 ways, for example, as 2226762310756 + 19007271831289 = 1492234^2 + 4359733^2 .

It is not a de Polignac number, because 21234034142045 - 2¹⁶ = 21234034076509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21234034141996 and 21234034142014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234034142047) 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, 142703285 + ... + 142852005.

It is an arithmetic number, because the mean of its divisors is an integer number (845713230075).

Almost surely, 2^{21234034142045} is an apocalyptic number.

It is an amenable number.

21234034142045 is a deficient number, since it is larger than the sum of its proper divisors (5828789220355).

21234034142045 is a wasteful number, since it uses less digits than its factorization.

21234034142045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153905.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21234034142045 its reverse (54024143043212), we get a palindrome (75258177185257).

The spelling of 21234034142045 in words is "twenty-one trillion, two hundred thirty-four billion, thirty-four million, one hundred forty-two thousand, forty-five".