21069468 has 36 divisors (see below), whose sum is σ = 60868080. Its totient is φ = 6019776.

The previous prime is 21069439. The next prime is 21069487. The reversal of 21069468 is 86496012.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 41553 + ... + 42056.

It is an arithmetic number, because the mean of its divisors is an integer number (1690780).

Almost surely, 2^21069468 is an apocalyptic number.

21069468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21069468 is an abundant number, since it is smaller than the sum of its proper divisors (39798612).

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

21069468 is a wasteful number, since it uses less digits than its factorization.

21069468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83626 (or 83621 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 21069468 is about 4590.1490171889. The cubic root of 21069468 is about 276.1963001754.

The spelling of 21069468 in words is "twenty-one million, sixty-nine thousand, four hundred sixty-eight".