21323124254 has 32 divisors (see below), whose sum is σ = 32823470592. Its totient is φ = 10385856000.

The previous prime is 21323124233. The next prime is 21323124287. The reversal of 21323124254 is 45242132312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5613884 + ... + 5617680.

It is an arithmetic number, because the mean of its divisors is an integer number (1025733456).

Almost surely, 2^21323124254 is an apocalyptic number.

21323124254 is a deficient number, since it is larger than the sum of its proper divisors (11500346338).

21323124254 is a wasteful number, since it uses less digits than its factorization.

21323124254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292.

The product of its digits is 11520, while the sum is 29.

Adding to 21323124254 its reverse (45242132312), we get a palindrome (66565256566).

The spelling of 21323124254 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-four thousand, two hundred fifty-four".