221924951 has 2 divisors, whose sum is σ = 221924952. Its totient is φ = 221924950.

The previous prime is 221924887. The next prime is 221924957. The reversal of 221924951 is 159429122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221924951 - 2⁶ = 221924887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221924957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110962475 + 110962476.

It is an arithmetic number, because the mean of its divisors is an integer number (110962476).

Almost surely, 2^221924951 is an apocalyptic number.

221924951 is a deficient number, since it is larger than the sum of its proper divisors (1).

221924951 is an equidigital number, since it uses as much as digits as its factorization.

221924951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 221924951 is about 14897.1457333276. The cubic root of 221924951 is about 605.4366549236.

The spelling of 221924951 in words is "two hundred twenty-one million, nine hundred twenty-four thousand, nine hundred fifty-one".