21234154177 has 12 divisors (see below), whose sum is σ = 22503086320. Its totient is φ = 20025118512.

The previous prime is 21234154171. The next prime is 21234154213. The reversal of 21234154177 is 77145143212.

It is not a de Polignac number, because 21234154177 - 2³ = 21234154169 is a prime.

It is a super-2 number, since 2×21234154177² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234154171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257427 + ... + 329752.

Almost surely, 2^21234154177 is an apocalyptic number.

It is an amenable number.

21234154177 is a deficient number, since it is larger than the sum of its proper divisors (1268932143).

21234154177 is an equidigital number, since it uses as much as digits as its factorization.

21234154177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587280 (or 587251 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

Adding to 21234154177 its reverse (77145143212), we get a palindrome (98379297389).

The spelling of 21234154177 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-four thousand, one hundred seventy-seven".