221002691 has 12 divisors (see below), whose sum is σ = 276861312. Its totient is φ = 174858768.

The previous prime is 221002681. The next prime is 221002693. The reversal of 221002691 is 196200122.

It is not a de Polignac number, because 221002691 - 2¹⁰ = 221001667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172835 + ... + 174108.

It is an arithmetic number, because the mean of its divisors is an integer number (23071776).

Almost surely, 2^221002691 is an apocalyptic number.

221002691 is a deficient number, since it is larger than the sum of its proper divisors (55858621).

221002691 is a wasteful number, since it uses less digits than its factorization.

221002691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346970 (or 346963 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 221002691 is about 14866.1592551674. The cubic root of 221002691 is about 604.5968135331.

The spelling of 221002691 in words is "two hundred twenty-one million, two thousand, six hundred ninety-one".