20211705161155 has 16 divisors (see below), whose sum is σ = 24275413205568. Its totient is φ = 16155120400000.

The previous prime is 20211705161117. The next prime is 20211705161239. The reversal of 20211705161155 is 55116150711202.

It is not a de Polignac number, because 20211705161155 - 2¹⁵ = 20211705128387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336265605 + ... + 336325705.

It is an arithmetic number, because the mean of its divisors is an integer number (1517213325348).

Almost surely, 2^{20211705161155} is an apocalyptic number.

20211705161155 is a deficient number, since it is larger than the sum of its proper divisors (4063708044413).

20211705161155 is a wasteful number, since it uses less digits than its factorization.

20211705161155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118238.

The product of its (nonzero) digits is 21000, while the sum is 37.

Adding to 20211705161155 its reverse (55116150711202), we get a palindrome (75327855872357).

The spelling of 20211705161155 in words is "twenty trillion, two hundred eleven billion, seven hundred five million, one hundred sixty-one thousand, one hundred fifty-five".