221407923 has 8 divisors (see below), whose sum is σ = 322047936. Its totient is φ = 134186600.

The previous prime is 221407919. The next prime is 221407933. The reversal of 221407923 is 329704122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221407923 - 2² = 221407919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221407933) 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, 3354633 + ... + 3354698.

It is an arithmetic number, because the mean of its divisors is an integer number (40255992).

Almost surely, 2^221407923 is an apocalyptic number.

221407923 is a deficient number, since it is larger than the sum of its proper divisors (100640013).

221407923 is a wasteful number, since it uses less digits than its factorization.

221407923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6709345.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 221407923 is about 14879.7823572793. The cubic root of 221407923 is about 604.9661188139.

The spelling of 221407923 in words is "two hundred twenty-one million, four hundred seven thousand, nine hundred twenty-three".