21100413 has 8 divisors (see below), whose sum is σ = 28664928. Its totient is φ = 13801424.

The previous prime is 21100411. The next prime is 21100423. The reversal of 21100413 is 31400112.

It is a happy number.

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 21100413 - 2¹ = 21100411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100411) 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, 66195 + ... + 66512.

It is an arithmetic number, because the mean of its divisors is an integer number (3583116).

Almost surely, 2^21100413 is an apocalyptic number.

It is an amenable number.

21100413 is a deficient number, since it is larger than the sum of its proper divisors (7564515).

21100413 is a wasteful number, since it uses less digits than its factorization.

21100413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132763.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21100413 is about 4593.5185860079. The cubic root of 21100413 is about 276.3314517228.

Adding to 21100413 its reverse (31400112), we get a palindrome (52500525).

The spelling of 21100413 in words is "twenty-one million, one hundred thousand, four hundred thirteen".