21140410 has 8 divisors (see below), whose sum is σ = 38052756. Its totient is φ = 8456160.

The previous prime is 21140389. The next prime is 21140423. The reversal of 21140410 is 1404112.

It can be written as a sum of positive squares in 2 ways, for example, as 19545241 + 1595169 = 4421^2 + 1263^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057011 + ... + 1057030.

Almost surely, 2^21140410 is an apocalyptic number.

21140410 is a deficient number, since it is larger than the sum of its proper divisors (16912346).

21140410 is a wasteful number, since it uses less digits than its factorization.

21140410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114048.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21140410 is about 4597.8701591063. The cubic root of 21140410 is about 276.5059420345.

Adding to 21140410 its reverse (1404112), we get a palindrome (22544522).

The spelling of 21140410 in words is "twenty-one million, one hundred forty thousand, four hundred ten".