21486829 has 24 divisors (see below), whose sum is σ = 27300672. Its totient is φ = 16548480.

The previous prime is 21486821. The next prime is 21486859. The reversal of 21486829 is 92868412.

It is not a de Polignac number, because 21486829 - 2³ = 21486821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21486791 and 21486800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48282 + ... + 48724.

It is an arithmetic number, because the mean of its divisors is an integer number (1137528).

Almost surely, 2^21486829 is an apocalyptic number.

It is an amenable number.

21486829 is a deficient number, since it is larger than the sum of its proper divisors (5813843).

21486829 is a wasteful number, since it uses less digits than its factorization.

21486829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 504 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 21486829 is about 4635.3887647100. The cubic root of 21486829 is about 278.0080954460.

The spelling of 21486829 in words is "twenty-one million, four hundred eighty-six thousand, eight hundred twenty-nine".