21196093 has 4 divisors (see below), whose sum is σ = 22442940. Its totient is φ = 19949248.

The previous prime is 21196081. The next prime is 21196103. The reversal of 21196093 is 39069112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 5212089 = 3998^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 21196093 - 2²¹ = 19098941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196003) 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, 623398 + ... + 623431.

It is an arithmetic number, because the mean of its divisors is an integer number (5610735).

Almost surely, 2^21196093 is an apocalyptic number.

It is an amenable number.

21196093 is a deficient number, since it is larger than the sum of its proper divisors (1246847).

21196093 is a wasteful number, since it uses less digits than its factorization.

21196093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246846.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21196093 is about 4603.9214806510. The cubic root of 21196093 is about 276.7484977533.

The spelling of 21196093 in words is "twenty-one million, one hundred ninety-six thousand, ninety-three".