221870007 has 12 divisors (see below), whose sum is σ = 330817344. Its totient is φ = 143141760.

The previous prime is 221869997. The next prime is 221870023. The reversal of 221870007 is 700078122.

It is not a de Polignac number, because 221870007 - 2¹⁸ = 221607863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221870107) 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, 397338 + ... + 397895.

It is an arithmetic number, because the mean of its divisors is an integer number (27568112).

Almost surely, 2^221870007 is an apocalyptic number.

221870007 is a deficient number, since it is larger than the sum of its proper divisors (108947337).

221870007 is a wasteful number, since it uses less digits than its factorization.

221870007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795270 (or 795267 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 221870007 is about 14895.3015075224. The cubic root of 221870007 is about 605.3866862937.

The spelling of 221870007 in words is "two hundred twenty-one million, eight hundred seventy thousand, seven".