21623234354 has 16 divisors (see below), whose sum is σ = 36150300000. Its totient is φ = 9640079424.

The previous prime is 21623234317. The next prime is 21623234377. The reversal of 21623234354 is 45343232612.

It is a happy number.

It is a super-3 number, since 3×21623234354³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16735604 + ... + 16736895.

It is an arithmetic number, because the mean of its divisors is an integer number (2259393750).

Almost surely, 2^21623234354 is an apocalyptic number.

21623234354 is a deficient number, since it is larger than the sum of its proper divisors (14527065646).

21623234354 is a wasteful number, since it uses less digits than its factorization.

21623234354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33472537.

The product of its digits is 103680, while the sum is 35.

Adding to 21623234354 its reverse (45343232612), we get a palindrome (66966466966).

The spelling of 21623234354 in words is "twenty-one billion, six hundred twenty-three million, two hundred thirty-four thousand, three hundred fifty-four".