21410293 has 4 divisors (see below), whose sum is σ = 22669740. Its totient is φ = 20150848.

The previous prime is 21410287. The next prime is 21410297. The reversal of 21410293 is 39201412.

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 5870929 + 15539364 = 2423^2 + 3942^2 .

It is not a de Polignac number, because 21410293 - 2⁵ = 21410261 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 (21410297) 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, 629698 + ... + 629731.

It is an arithmetic number, because the mean of its divisors is an integer number (5667435).

Almost surely, 2^21410293 is an apocalyptic number.

It is an amenable number.

21410293 is a deficient number, since it is larger than the sum of its proper divisors (1259447).

21410293 is a wasteful number, since it uses less digits than its factorization.

21410293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259446.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21410293 is about 4627.1257817354. The cubic root of 21410293 is about 277.6776148321.

The spelling of 21410293 in words is "twenty-one million, four hundred ten thousand, two hundred ninety-three".