21604142163351 has 16 divisors (see below), whose sum is σ = 32437890874368. Its totient is φ = 12671051121600.

The previous prime is 21604142163319. The next prime is 21604142163367. The reversal of 21604142163351 is 15336124140612.

It is not a de Polignac number, because 21604142163351 - 2⁵ = 21604142163319 is a prime.

It is a super-2 number, since 2×21604142163351² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604142163451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10559208246 + ... + 10559210291.

It is an arithmetic number, because the mean of its divisors is an integer number (2027368179648).

Almost surely, 2^{21604142163351} is an apocalyptic number.

21604142163351 is a deficient number, since it is larger than the sum of its proper divisors (10833748711017).

21604142163351 is a wasteful number, since it uses less digits than its factorization.

21604142163351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21118418582.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21604142163351 in words is "twenty-one trillion, six hundred four billion, one hundred forty-two million, one hundred sixty-three thousand, three hundred fifty-one".