106978221 has 72 divisors (see below), whose sum is σ = 192067200. Its totient is φ = 57081024.

The previous prime is 106978177. The next prime is 106978237. The reversal of 106978221 is 122879601.

It is not a de Polignac number, because 106978221 - 2¹¹ = 106976173 is a prime.

It is a super-2 number, since 2×106978221² = 22888679536649682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106978271) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 537480 + ... + 537678.

It is an arithmetic number, because the mean of its divisors is an integer number (2667600).

Almost surely, 2^106978221 is an apocalyptic number.

It is an amenable number.

106978221 is a deficient number, since it is larger than the sum of its proper divisors (85088979).

106978221 is a wasteful number, since it uses less digits than its factorization.

106978221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 106978221 is about 10343.0276515148. The cubic root of 106978221 is about 474.7137274118.

The spelling of 106978221 in words is "one hundred six million, nine hundred seventy-eight thousand, two hundred twenty-one".