21196147 has 4 divisors (see below), whose sum is σ = 24224176. Its totient is φ = 18168120.

The previous prime is 21196103. The next prime is 21196159. The reversal of 21196147 is 74169112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21196147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21196177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514004 + ... + 1514017.

It is an arithmetic number, because the mean of its divisors is an integer number (6056044).

Almost surely, 2^21196147 is an apocalyptic number.

21196147 is a deficient number, since it is larger than the sum of its proper divisors (3028029).

21196147 is an equidigital number, since it uses as much as digits as its factorization.

21196147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028028.

The product of its digits is 3024, while the sum is 31.

The square root of 21196147 is about 4603.9273452130. The cubic root of 21196147 is about 276.7487327716.

The spelling of 21196147 in words is "twenty-one million, one hundred ninety-six thousand, one hundred forty-seven".