221402151 has 6 divisors (see below), whose sum is σ = 319803120. Its totient is φ = 147601428.

The previous prime is 221402149. The next prime is 221402177. The reversal of 221402151 is 151204122.

It is not a de Polignac number, because 221402151 - 2¹ = 221402149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221402131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12300111 + ... + 12300128.

It is an arithmetic number, because the mean of its divisors is an integer number (53300520).

Almost surely, 2^221402151 is an apocalyptic number.

221402151 is a deficient number, since it is larger than the sum of its proper divisors (98400969).

221402151 is a wasteful number, since it uses less digits than its factorization.

221402151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24600245 (or 24600242 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221402151 is about 14879.5884015654. The cubic root of 221402151 is about 604.9608617078.

Adding to 221402151 its reverse (151204122), we get a palindrome (372606273).

It can be divided in two parts, 2 and 21402151, that added together give a triangular number (21402153 = T₆₅₄₂).

The spelling of 221402151 in words is "two hundred twenty-one million, four hundred two thousand, one hundred fifty-one".