21603272253666 has 16 divisors (see below), whose sum is σ = 43215943419264. Its totient is φ = 7199524265904.

The previous prime is 21603272253649. The next prime is 21603272253683. The reversal of 21603272253666 is 66635227230612.

It is an interprime number because it is at equal distance from previous prime (21603272253649) and next prime (21603272253683).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391591450 + ... + 391646613.

It is an arithmetic number, because the mean of its divisors is an integer number (2700996463704).

Almost surely, 2^{21603272253666} is an apocalyptic number.

21603272253666 is an abundant number, since it is smaller than the sum of its proper divisors (21612671165598).

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

21603272253666 is a wasteful number, since it uses less digits than its factorization.

21603272253666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783242665.

The product of its (nonzero) digits is 6531840, while the sum is 51.

The spelling of 21603272253666 in words is "twenty-one trillion, six hundred three billion, two hundred seventy-two million, two hundred fifty-three thousand, six hundred sixty-six".