21398656246 has 8 divisors (see below), whose sum is σ = 35015982984. Its totient is φ = 9726661920.

The previous prime is 21398656241. The next prime is 21398656247. The reversal of 21398656246 is 64265689312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21398656193 and 21398656202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21398656241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486333075 + ... + 486333118.

It is an arithmetic number, because the mean of its divisors is an integer number (4376997873).

Almost surely, 2^21398656246 is an apocalyptic number.

21398656246 is a deficient number, since it is larger than the sum of its proper divisors (13617326738).

21398656246 is a wasteful number, since it uses less digits than its factorization.

21398656246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972666206.

The product of its digits is 3732480, while the sum is 52.

The spelling of 21398656246 in words is "twenty-one billion, three hundred ninety-eight million, six hundred fifty-six thousand, two hundred forty-six".