221902871 has 2 divisors, whose sum is σ = 221902872. Its totient is φ = 221902870.

The previous prime is 221902859. The next prime is 221902883. The reversal of 221902871 is 178209122.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (221902859) and next prime (221902883).

It is a cyclic number.

It is not a de Polignac number, because 221902871 - 2¹⁴ = 221886487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221902841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110951435 + 110951436.

It is an arithmetic number, because the mean of its divisors is an integer number (110951436).

Almost surely, 2^221902871 is an apocalyptic number.

221902871 is a deficient number, since it is larger than the sum of its proper divisors (1).

221902871 is an equidigital number, since it uses as much as digits as its factorization.

221902871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 221902871 is about 14896.4046333335. The cubic root of 221902871 is about 605.4165753356.

The spelling of 221902871 in words is "two hundred twenty-one million, nine hundred two thousand, eight hundred seventy-one".