21101214122178 has 32 divisors (see below), whose sum is σ = 42746584173696. Its totient is φ = 6943476231168.

The previous prime is 21101214122137. The next prime is 21101214122179. The reversal of 21101214122178 is 87122141210112.

It is a super-2 number, since 2×21101214122178² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21101214122179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53659551 + ... + 54051362.

It is an arithmetic number, because the mean of its divisors is an integer number (1335830755428).

Almost surely, 2^{21101214122178} is an apocalyptic number.

21101214122178 is an abundant number, since it is smaller than the sum of its proper divisors (21645370051518).

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

21101214122178 is a wasteful number, since it uses less digits than its factorization.

21101214122178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107711338.

The product of its (nonzero) digits is 3584, while the sum is 33.

The spelling of 21101214122178 in words is "twenty-one trillion, one hundred one billion, two hundred fourteen million, one hundred twenty-two thousand, one hundred seventy-eight".