21683230811655 has 64 divisors (see below), whose sum is σ = 41063011292160. Its totient is φ = 9559689624576.

The previous prime is 21683230811639. The next prime is 21683230811657. The reversal of 21683230811655 is 55611803238612.

It is not a de Polignac number, because 21683230811655 - 2⁴ = 21683230811639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21683230811598 and 21683230811607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683230811657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1343502 + ... + 6720971.

It is an arithmetic number, because the mean of its divisors is an integer number (641609551440).

Almost surely, 2^{21683230811655} is an apocalyptic number.

21683230811655 is a deficient number, since it is larger than the sum of its proper divisors (19379780480505).

21683230811655 is a wasteful number, since it uses less digits than its factorization.

21683230811655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065400.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 21683230811655 in words is "twenty-one trillion, six hundred eighty-three billion, two hundred thirty million, eight hundred eleven thousand, six hundred fifty-five".