221226981 has 8 divisors (see below), whose sum is σ = 295093440. Its totient is φ = 147422592.

The previous prime is 221226977. The next prime is 221226989. The reversal of 221226981 is 189622122.

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

It is not a de Polignac number, because 221226981 - 2² = 221226977 is a prime.

It is a super-2 number, since 2×221226981² = 97882754244748722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221226989) 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, 6441 + ... + 21998.

It is an arithmetic number, because the mean of its divisors is an integer number (36886680).

Almost surely, 2^221226981 is an apocalyptic number.

It is an amenable number.

221226981 is a deficient number, since it is larger than the sum of its proper divisors (73866459).

221226981 is a wasteful number, since it uses less digits than its factorization.

221226981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31035.

The product of its digits is 6912, while the sum is 33.

The square root of 221226981 is about 14873.7009852962. The cubic root of 221226981 is about 604.8012743484.

The spelling of 221226981 in words is "two hundred twenty-one million, two hundred twenty-six thousand, nine hundred eighty-one".