21234047506 has 32 divisors (see below), whose sum is σ = 38575084032. Its totient is φ = 8557747200.

The previous prime is 21234047473. The next prime is 21234047519. The reversal of 21234047506 is 60574043212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248695 + ... + 322981.

It is an arithmetic number, because the mean of its divisors is an integer number (1205471376).

Almost surely, 2^21234047506 is an apocalyptic number.

21234047506 is a deficient number, since it is larger than the sum of its proper divisors (17341036526).

21234047506 is a wasteful number, since it uses less digits than its factorization.

21234047506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75514.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 21234047506 in words is "twenty-one billion, two hundred thirty-four million, forty-seven thousand, five hundred six".