21346403 has 4 divisors (see below), whose sum is σ = 22988448. Its totient is φ = 19704360.

The previous prime is 21346397. The next prime is 21346411. The reversal of 21346403 is 30464312.

It is a happy number.

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

It is not a de Polignac number, because 21346403 - 2⁴ = 21346387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21346453) 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, 821003 + ... + 821028.

It is an arithmetic number, because the mean of its divisors is an integer number (5747112).

Almost surely, 2^21346403 is an apocalyptic number.

21346403 is a deficient number, since it is larger than the sum of its proper divisors (1642045).

21346403 is a wasteful number, since it uses less digits than its factorization.

21346403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642044.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 21346403 is about 4620.2167698064. The cubic root of 21346403 is about 277.4011356826.

The spelling of 21346403 in words is "twenty-one million, three hundred forty-six thousand, four hundred three".