21467830 has 16 divisors (see below), whose sum is σ = 39975120. Its totient is φ = 8290912.

The previous prime is 21467813. The next prime is 21467833. The reversal of 21467830 is 3876412.

It is a junction number, because it is equal to n+sod(n) for n = 21467792 and 21467801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36724 + ... + 37303.

It is an arithmetic number, because the mean of its divisors is an integer number (2498445).

Almost surely, 2^21467830 is an apocalyptic number.

21467830 is a deficient number, since it is larger than the sum of its proper divisors (18507290).

21467830 is a wasteful number, since it uses less digits than its factorization.

21467830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74063.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21467830 is about 4633.3389688215. The cubic root of 21467830 is about 277.9261315393.

The spelling of 21467830 in words is "twenty-one million, four hundred sixty-seven thousand, eight hundred thirty".