191421802 has 32 divisors (see below), whose sum is σ = 357182784. Its totient is φ = 75590400.

The previous prime is 191421793. The next prime is 191421803. The reversal of 191421802 is 208124191.

It is not an unprimeable number, because it can be changed into a prime (191421803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14824 + ... + 24547.

It is an arithmetic number, because the mean of its divisors is an integer number (11161962).

Almost surely, 2^191421802 is an apocalyptic number.

191421802 is a deficient number, since it is larger than the sum of its proper divisors (165760982).

191421802 is a wasteful number, since it uses less digits than its factorization.

191421802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39414.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 191421802 is about 13835.5268060165. The cubic root of 191421802 is about 576.3201445755.

Adding to 191421802 its reverse (208124191), we get a palindrome (399545993).

It can be divided in two parts, 1914 and 21802, that added together give a square (23716 = 154²).

The spelling of 191421802 in words is "one hundred ninety-one million, four hundred twenty-one thousand, eight hundred two".