21121101174 has 16 divisors (see below), whose sum is σ = 42293167920. Its totient is φ = 7031872800.

The previous prime is 21121101173. The next prime is 21121101247. The reversal of 21121101174 is 47110112112.

It is a happy number.

It is a super-2 number, since 2×21121101174² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121101174.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121101173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2118177 + ... + 2128124.

It is an arithmetic number, because the mean of its divisors is an integer number (2643322995).

Almost surely, 2^21121101174 is an apocalyptic number.

21121101174 is an abundant number, since it is smaller than the sum of its proper divisors (21172066746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121101174 is a wasteful number, since it uses less digits than its factorization.

21121101174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247135.

The product of its (nonzero) digits is 112, while the sum is 21.

Adding to 21121101174 its reverse (47110112112), we get a palindrome (68231213286).

The spelling of 21121101174 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, one hundred seventy-four".