21234073772 has 12 divisors (see below), whose sum is σ = 37216539696. Its totient is φ = 10600776720.

The previous prime is 21234073759. The next prime is 21234073781. The reversal of 21234073772 is 27737043212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062104 + ... + 4067327.

It is an arithmetic number, because the mean of its divisors is an integer number (3101378308).

Almost surely, 2^21234073772 is an apocalyptic number.

It is an amenable number.

21234073772 is a deficient number, since it is larger than the sum of its proper divisors (15982465924).

21234073772 is a wasteful number, since it uses less digits than its factorization.

21234073772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130088 (or 8130086 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 38.

The spelling of 21234073772 in words is "twenty-one billion, two hundred thirty-four million, seventy-three thousand, seven hundred seventy-two".