21623034254 has 16 divisors (see below), whose sum is σ = 34048304640. Its totient is φ = 10285421880.

The previous prime is 21623034241. The next prime is 21623034299. The reversal of 21623034254 is 45243032612.

It is a super-2 number, since 2×21623034254² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21623034254.

It is a congruent 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, 2951924 + ... + 2959239.

It is an arithmetic number, because the mean of its divisors is an integer number (2128019040).

Almost surely, 2^21623034254 is an apocalyptic number.

21623034254 is a deficient number, since it is larger than the sum of its proper divisors (12425270386).

21623034254 is a wasteful number, since it uses less digits than its factorization.

21623034254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911255.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21623034254 its reverse (45243032612), we get a palindrome (66866066866).

The spelling of 21623034254 in words is "twenty-one billion, six hundred twenty-three million, thirty-four thousand, two hundred fifty-four".