221953461 has 8 divisors (see below), whose sum is σ = 297265920. Its totient is φ = 147304992.

The previous prime is 221953429. The next prime is 221953471. The reversal of 221953461 is 164359122.

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

It is not a de Polignac number, because 221953461 - 2⁵ = 221953429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221953471) 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, 165216 + ... + 166553.

It is an arithmetic number, because the mean of its divisors is an integer number (37158240).

Almost surely, 2^221953461 is an apocalyptic number.

It is an amenable number.

221953461 is a deficient number, since it is larger than the sum of its proper divisors (75312459).

221953461 is a wasteful number, since it uses less digits than its factorization.

221953461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331995.

The product of its digits is 12960, while the sum is 33.

The square root of 221953461 is about 14898.1025973108. The cubic root of 221953461 is about 605.4625799940.

The spelling of 221953461 in words is "two hundred twenty-one million, nine hundred fifty-three thousand, four hundred sixty-one".