21701464256 has 14 divisors (see below), whose sum is σ = 43063843260. Its totient is φ = 10850732096.

The previous prime is 21701464243. The next prime is 21701464271. The reversal of 21701464256 is 65246410712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169542626 + ... + 169542753.

Almost surely, 2^21701464256 is an apocalyptic number.

It is an amenable number.

21701464256 is a deficient number, since it is larger than the sum of its proper divisors (21362379004).

21701464256 is an equidigital number, since it uses as much as digits as its factorization.

21701464256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339085391 (or 339085381 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 21701464256 its reverse (65246410712), we get a palindrome (86947874968).

The spelling of 21701464256 in words is "twenty-one billion, seven hundred one million, four hundred sixty-four thousand, two hundred fifty-six".