21194277 has 16 divisors (see below), whose sum is σ = 30528960. Its totient is φ = 13001472.

The previous prime is 21194269. The next prime is 21194323. The reversal of 21194277 is 77249112.

It is not a de Polignac number, because 21194277 - 2³ = 21194269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15693 + ... + 16989.

It is an arithmetic number, because the mean of its divisors is an integer number (1908060).

Almost surely, 2^21194277 is an apocalyptic number.

It is an amenable number.

21194277 is a deficient number, since it is larger than the sum of its proper divisors (9334683).

21194277 is a wasteful number, since it uses less digits than its factorization.

21194277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732.

The product of its digits is 7056, while the sum is 33.

The square root of 21194277 is about 4603.7242532541. The cubic root of 21194277 is about 276.7405939441.

The spelling of 21194277 in words is "twenty-one million, one hundred ninety-four thousand, two hundred seventy-seven".