21413826 has 24 divisors (see below), whose sum is σ = 53025024. Its totient is φ = 6118200.

The previous prime is 21413789. The next prime is 21413827. The reversal of 21413826 is 62831412.

It is a self number, because there is not a number n which added to its sum of digits gives 21413826.

It is not an unprimeable number, because it can be changed into a prime (21413827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84850 + ... + 85101.

It is an arithmetic number, because the mean of its divisors is an integer number (2209376).

Almost surely, 2^21413826 is an apocalyptic number.

21413826 is an abundant number, since it is smaller than the sum of its proper divisors (31611198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21413826 is a wasteful number, since it uses less digits than its factorization.

21413826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169966 (or 169963 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21413826 is about 4627.5075364606. The cubic root of 21413826 is about 277.6928875650.

The spelling of 21413826 in words is "twenty-one million, four hundred thirteen thousand, eight hundred twenty-six".