21749763694 has 16 divisors (see below), whose sum is σ = 33404318640. Its totient is φ = 10615308480.

The previous prime is 21749763691. The next prime is 21749763697. The reversal of 21749763694 is 49636794712.

It is an interprime number because it is at equal distance from previous prime (21749763691) and next prime (21749763697).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21749763691) 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, 59784 + ... + 216964.

It is an arithmetic number, because the mean of its divisors is an integer number (2087769915).

Almost surely, 2^21749763694 is an apocalyptic number.

21749763694 is a deficient number, since it is larger than the sum of its proper divisors (11654554946).

21749763694 is a wasteful number, since it uses less digits than its factorization.

21749763694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158835.

The product of its digits is 13716864, while the sum is 58.

The spelling of 21749763694 in words is "twenty-one billion, seven hundred forty-nine million, seven hundred sixty-three thousand, six hundred ninety-four".