21355342170251 has 16 divisors (see below), whose sum is σ = 23052518818560. Its totient is φ = 19722239312160.

The previous prime is 21355342170229. The next prime is 21355342170293. The reversal of 21355342170251 is 15207124355312.

It is a cyclic number.

It is not a de Polignac number, because 21355342170251 - 2⁶ = 21355342170187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21355342170199 and 21355342170208.

It is not an unprimeable number, because it can be changed into a prime (21355342970251) 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, 82399196 + ... + 82657958.

It is an arithmetic number, because the mean of its divisors is an integer number (1440782426160).

Almost surely, 2^{21355342170251} is an apocalyptic number.

21355342170251 is a deficient number, since it is larger than the sum of its proper divisors (1697176648309).

21355342170251 is a wasteful number, since it uses less digits than its factorization.

21355342170251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382546.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 21355342170251 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-two million, one hundred seventy thousand, two hundred fifty-one".