21748168920738 has 32 divisors (see below), whose sum is σ = 46842504230592. Its totient is φ = 6691702248000.

The previous prime is 21748168920727. The next prime is 21748168920767. The reversal of 21748168920738 is 83702986184712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13026693 + ... + 14601063.

It is an arithmetic number, because the mean of its divisors is an integer number (1463828257206).

Almost surely, 2^{21748168920738} is an apocalyptic number.

21748168920738 is an abundant number, since it is smaller than the sum of its proper divisors (25094335309854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21748168920738 is a wasteful number, since it uses less digits than its factorization.

21748168920738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751490.

The product of its (nonzero) digits is 65028096, while the sum is 66.

The spelling of 21748168920738 in words is "twenty-one trillion, seven hundred forty-eight billion, one hundred sixty-eight million, nine hundred twenty thousand, seven hundred thirty-eight".