21753921386156 has 6 divisors (see below), whose sum is σ = 38069362425780. Its totient is φ = 10876960693076.

The previous prime is 21753921386101. The next prime is 21753921386167. The reversal of 21753921386156 is 65168312935712.

It is a junction number, because it is equal to n+sod(n) for n = 21753921386095 and 21753921386104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719240173266 + ... + 2719240173273.

It is an arithmetic number, because the mean of its divisors is an integer number (6344893737630).

Almost surely, 2^{21753921386156} is an apocalyptic number.

It is an amenable number.

21753921386156 is a deficient number, since it is larger than the sum of its proper divisors (16315441039624).

21753921386156 is a wasteful number, since it uses less digits than its factorization.

21753921386156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438480346543 (or 5438480346541 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 59.

The spelling of 21753921386156 in words is "twenty-one trillion, seven hundred fifty-three billion, nine hundred twenty-one million, three hundred eighty-six thousand, one hundred fifty-six".