221054951 has 4 divisors (see below), whose sum is σ = 238059192. Its totient is φ = 204050712.

The previous prime is 221054929. The next prime is 221054957. The reversal of 221054951 is 159450122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221054951 - 2²⁶ = 153946087 is a prime.

It is a super-2 number, since 2×221054951² = 97730582723224802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221054957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8502101 + ... + 8502126.

It is an arithmetic number, because the mean of its divisors is an integer number (59514798).

Almost surely, 2^221054951 is an apocalyptic number.

221054951 is a deficient number, since it is larger than the sum of its proper divisors (17004241).

221054951 is a wasteful number, since it uses less digits than its factorization.

221054951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004240.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 221054951 is about 14867.9168345804. The cubic root of 221054951 is about 604.6444656517.

The spelling of 221054951 in words is "two hundred twenty-one million, fifty-four thousand, nine hundred fifty-one".