21303263654 has 8 divisors (see below), whose sum is σ = 32253539688. Its totient is φ = 10552083760.

The previous prime is 21303263633. The next prime is 21303263719. The reversal of 21303263654 is 45636230312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49773767 + ... + 49774194.

It is an arithmetic number, because the mean of its divisors is an integer number (4031692461).

Almost surely, 2^21303263654 is an apocalyptic number.

21303263654 is a deficient number, since it is larger than the sum of its proper divisors (10950276034).

21303263654 is a wasteful number, since it uses less digits than its factorization.

21303263654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99548070.

The product of its (nonzero) digits is 77760, while the sum is 35.

Adding to 21303263654 its reverse (45636230312), we get a palindrome (66939493966).

The spelling of 21303263654 in words is "twenty-one billion, three hundred three million, two hundred sixty-three thousand, six hundred fifty-four".