221081955 has 8 divisors (see below), whose sum is σ = 353731152. Its totient is φ = 117910368.

The previous prime is 221081941. The next prime is 221081983. The reversal of 221081955 is 559180122.

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

It is not a de Polignac number, because 221081955 - 2⁷ = 221081827 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7369384 + ... + 7369413.

It is an arithmetic number, because the mean of its divisors is an integer number (44216394).

Almost surely, 2^221081955 is an apocalyptic number.

221081955 is a deficient number, since it is larger than the sum of its proper divisors (132649197).

221081955 is a wasteful number, since it uses less digits than its factorization.

221081955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14738805.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 221081955 is about 14868.8249367595. The cubic root of 221081955 is about 604.6690857054.

The spelling of 221081955 in words is "two hundred twenty-one million, eighty-one thousand, nine hundred fifty-five".