21194137 has 8 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 20919984.

The previous prime is 21194123. The next prime is 21194149. The reversal of 21194137 is 73149112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21194137 - 2⁷ = 21194009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21194197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29539 + ... + 30247.

It is an arithmetic number, because the mean of its divisors is an integer number (2683800).

Almost surely, 2^21194137 is an apocalyptic number.

It is an amenable number.

21194137 is a deficient number, since it is larger than the sum of its proper divisors (276263).

21194137 is a wasteful number, since it uses less digits than its factorization.

21194137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its digits is 1512, while the sum is 28.

The square root of 21194137 is about 4603.7090481480. The cubic root of 21194137 is about 276.7399846009.

The spelling of 21194137 in words is "twenty-one million, one hundred ninety-four thousand, one hundred thirty-seven".