221672051 has 2 divisors, whose sum is σ = 221672052. Its totient is φ = 221672050.

The previous prime is 221672047. The next prime is 221672071. The reversal of 221672051 is 150276122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221672051 - 2² = 221672047 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221672051.

It is not a weakly prime, because it can be changed into another prime (221672021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110836025 + 110836026.

It is an arithmetic number, because the mean of its divisors is an integer number (110836026).

Almost surely, 2^221672051 is an apocalyptic number.

221672051 is a deficient number, since it is larger than the sum of its proper divisors (1).

221672051 is an equidigital number, since it uses as much as digits as its factorization.

221672051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 221672051 is about 14888.6551105196. The cubic root of 221672051 is about 605.2065874644.

The spelling of 221672051 in words is "two hundred twenty-one million, six hundred seventy-two thousand, fifty-one".