21155350635151 has 16 divisors (see below), whose sum is σ = 22642474536000. Its totient is φ = 19696349173248.

The previous prime is 21155350635149. The next prime is 21155350635271. The reversal of 21155350635151 is 15153605355112.

It is a cyclic number.

It is not a de Polignac number, because 21155350635151 - 2¹ = 21155350635149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155350635098 and 21155350635107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155350636151) 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, 17488236 + ... + 18658753.

It is an arithmetic number, because the mean of its divisors is an integer number (1415154658500).

Almost surely, 2^{21155350635151} is an apocalyptic number.

21155350635151 is a deficient number, since it is larger than the sum of its proper divisors (1487123900849).

21155350635151 is a wasteful number, since it uses less digits than its factorization.

21155350635151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36147378.

The product of its (nonzero) digits is 337500, while the sum is 43.

The spelling of 21155350635151 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred fifty million, six hundred thirty-five thousand, one hundred fifty-one".