21763438634 has 16 divisors (see below), whose sum is σ = 37311355968. Its totient is φ = 9326536992.

The previous prime is 21763438559. The next prime is 21763438637. The reversal of 21763438634 is 43683436712.

It is a super-2 number, since 2×21763438634² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21763438637) 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, 192062 + ... + 283574.

It is an arithmetic number, because the mean of its divisors is an integer number (2331959748).

Almost surely, 2^21763438634 is an apocalyptic number.

21763438634 is a deficient number, since it is larger than the sum of its proper divisors (15547917334).

21763438634 is a wasteful number, since it uses less digits than its factorization.

21763438634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108509.

The product of its digits is 1741824, while the sum is 47.

The spelling of 21763438634 in words is "twenty-one billion, seven hundred sixty-three million, four hundred thirty-eight thousand, six hundred thirty-four".