21655420600426 has 16 divisors (see below), whose sum is σ = 33867831306240. Its totient is φ = 10372023330480.

The previous prime is 21655420600367. The next prime is 21655420600427. The reversal of 21655420600426 is 62400602455612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21655420600427) 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 7 ways as a sum of consecutive naturals, for example, 1469950590 + ... + 1469965321.

It is an arithmetic number, because the mean of its divisors is an integer number (2116739456640).

Almost surely, 2^{21655420600426} is an apocalyptic number.

21655420600426 is a deficient number, since it is larger than the sum of its proper divisors (12212410705814).

21655420600426 is a wasteful number, since it uses less digits than its factorization.

21655420600426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939916069.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 21655420600426 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred twenty million, six hundred thousand, four hundred twenty-six".