21430663246 has 8 divisors (see below), whose sum is σ = 32533296264. Its totient is φ = 10586231160.

The previous prime is 21430663237. The next prime is 21430663249. The reversal of 21430663246 is 64236603412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430663249) 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, 64550025 + ... + 64550356.

It is an arithmetic number, because the mean of its divisors is an integer number (4066662033).

Almost surely, 2^21430663246 is an apocalyptic number.

21430663246 is a deficient number, since it is larger than the sum of its proper divisors (11102633018).

21430663246 is a wasteful number, since it uses less digits than its factorization.

21430663246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129100466.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 21430663246 in words is "twenty-one billion, four hundred thirty million, six hundred sixty-three thousand, two hundred forty-six".