21449802 has 16 divisors (see below), whose sum is σ = 46799712. Its totient is φ = 6499920.

The previous prime is 21449797. The next prime is 21449807. The reversal of 21449802 is 20894412.

It is an interprime number because it is at equal distance from previous prime (21449797) and next prime (21449807).

It is a self number, because there is not a number n which added to its sum of digits gives 21449802.

It is not an unprimeable number, because it can be changed into a prime (21449807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162433 + ... + 162564.

It is an arithmetic number, because the mean of its divisors is an integer number (2924982).

Almost surely, 2^21449802 is an apocalyptic number.

21449802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21449802 is an abundant number, since it is smaller than the sum of its proper divisors (25349910).

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

21449802 is a wasteful number, since it uses less digits than its factorization.

21449802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325013.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21449802 is about 4631.3930949553. The cubic root of 21449802 is about 277.8483119134.

The spelling of 21449802 in words is "twenty-one million, four hundred forty-nine thousand, eight hundred two".