21603426249 has 8 divisors (see below), whose sum is σ = 29417431680. Its totient is φ = 14095852496.

The previous prime is 21603426211. The next prime is 21603426283. The reversal of 21603426249 is 94262430612.

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

It is a cyclic number.

It is not a de Polignac number, because 21603426249 - 2⁷ = 21603426121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21603426349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76607754 + ... + 76608035.

It is an arithmetic number, because the mean of its divisors is an integer number (3677178960).

Almost surely, 2^21603426249 is an apocalyptic number.

It is an amenable number.

21603426249 is a deficient number, since it is larger than the sum of its proper divisors (7814005431).

21603426249 is a wasteful number, since it uses less digits than its factorization.

21603426249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153215839.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 21603426249 in words is "twenty-one billion, six hundred three million, four hundred twenty-six thousand, two hundred forty-nine".